"first trimester of gestation (cow)"

"Embryo development period during the first 3 months of gestation, up to day 90 of development."

"second trimester of gestation (cow)"

"Embryo development period during the second trimester of gestation, from over day 90 up to day 180 of development."

"third trimester of gestation (cow)"

"Embryo development period during the last trimester of gestation, from the seventh month (over 180 days) of development until birth."

"first month of gestation (cow)"

"Embryo development period during the first month of gestation."

"second month of gestation (cow)"

"Embryo development period during the second month of gestation (30 to 60 days)."

"third month of gestation (cow)"

"Embryo development period during the third month of gestation (60 to 90 days)."

"fourth month of gestation (cow)"

"Embryo development period during the fourth month of gestation (90 to 120 days)."

"fifth month of gestation (cow)"

"Embryo development period during the fifth month of gestation (120 to 150 days)."

"sixth month of gestation (cow)"

"Embryo development period during the sixth month of gestation (150 to 180 days)."

"seventh month of gestation (cow)"

"Embryo development period during the seventh month of gestation (180 to 210 days)."

"eighth month of gestation cow stage (cow)"

"Embryo development period during the eighth month of gestation (210 to 240 days)."

"ninth and over month of gestation (cow)"

"Embryo development period during the ninth month of gestation (over 240 days) until birth."

"1-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 1 and under 2 months old."

"2-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 2 and under 3 months old."

"3-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 3 and under 4 months old."

"4-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 4 and under 5 months old."

"5-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 5 and under 6 months old."

"6-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 6 and under 7 months old."

"7-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 7 and under 8 months old."

"8-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 8 and under 9 months old."

"9-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 9 and under 10 months old."

"10-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 10 and under 11 months old."

"11-month-old stage (cow)"

"Cow developmental stage that refers to a calf who is over 11 and under 12 months old."

"12-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 12 and under 13 months old."

"13-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 13 and under 14 months old."

"14-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 14 and under 15 months old."

"15-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 15 and under 16 months old."

"16-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 16 and under 17 months old."

"17-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 17 and under 18 months old."

"18-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 18 and under 19 months old."

"19-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 19 and under 20 months old."

"20-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 20 and under 21 months old."

"21-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 21 and under 22 months old."

"22-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 22 and under 23 months old."

"23-month-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 23 and under 24 months old."

"2-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 24 months and under 3 years old."

"3-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 3 and under 4 years old."

"4-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 4 and under 5 years old."

"5-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 5 and under 6 years old."

"6-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 6 and under 7 years old."

"7-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 7 and under 8 years old."

"8-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 8 and under 9 years old."

"9-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 9 and under 10 years old."

"10-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 10 and under 11 years old."

"11-year-old stage (cow)"

"Cow developmental stage that refers to a cow who is over 11 and under 12 years old."

"first 0-6 postnatal days (cow)"

"Immature stage that refers to a new born calf which is under 7 days old."

"0-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is under 24 hours old."

"1-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 1 and under 2 days old."

"2-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 2 and under 3 days old."

"3-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 3 and under 4 days old."

"4-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 4 and under 5 days old."

"5-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 5 and under 6 days old."

"6-day-old stage (cow)"

"Postnatal stage that refers to a new born calf which is over 6 and under 7 days old."

"1-week-old stage (cow)"

"Immature stage that refers to a calf which is over 1 and under 2 weeks old."

"2-week-old stage (cow)"

"Immature stage that refers to a calf which is over 2 and under 3 weeks old."

"3-week-old stage (cow)"

"Immature stage that refers to a calf which is over 3 and under 4 weeks old."

"21-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"22-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"23-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"24-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"25-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"26-day-old stage (cow)"

"Immature stage that refers to a calf which is over 21 and under 22 days old."

"27-day-old stage (cow)"

"Immature stage that refers to a calf which is over 27 and under 28 days old."

"28-day-old stage (cow)"

"Immature stage that refers to a calf which is over 28 and under 29 days old."

"29-day-old stage (cow)"

"Immature stage that refers to a calf which is over 29 and under 30 days old."

"4-week-old stage (cow)"

"Immature stage that refers to a calf which is over 4 and under 5 weeks old."

"5-week-old stage (cow)"

"Immature stage that refers to a calf which is over 5 and under 6 weeks old."

"6-week-old stage (cow)"

"Immature stage that refers to a calf which is over 6 and under 7 weeks old."

"7-week-old stage (cow)"

"Immature stage that refers to a calf which is over 7 and under 8 weeks old."

"42-day-old stage (cow)"

"Immature stage that refers to a calf which is over 42 and under 43 days old."

"days 1-4 of fully formed stage (Drosophila pseudobscura)"

"The stage of Drosophila pseudobscura life-cycle from eclosion to the 4th day post-eclosion."

"days 5-8 of fully formed stage (Drosophila pseudobscura)"

"The stage of Drosophila pseudobscura life-cycle from the 5th day post-eclosion to 8th day post-eclosion."

"day 9 and more of fully formed stage (Drosophila pseudobscura)"

"The stage of Drosophila pseudobscura life-cycle from the 9th day post-eclosion to death."

"days 1-4 of fully formed stage (Drosophila simulans)"

"The stage of Drosophila simulans life-cycle from eclosion to the 4th day post-eclosion."

"days 5-8 of fully formed stage (Drosophila simulans)"

"The stage of Drosophila simulans life-cycle from the 5th day post-eclosion to 8th day post-eclosion."

"day 9 and more of fully formed stage (Drosophila simulans)"

"The stage of Drosophila simulans life-cycle from the 9th day post-eclosion to death."

"late extended germ band stage (fruit fly)"

"A collective term for stages 11 and 12."

"oogenesis stage S1 (fruit fly)"

"Earliest stage of ovarian cyst development - lasts while the 16 cell cyst is within the germarium (region 3)."

"oogenesis stage S2 (fruit fly)"

"Oogenesis stage that begins when the cyst leaves the germarium (from this point the cyst is referred to as an egg chamber). During this stage, polyploidation of the nurse cells begins, they reach a ploidy of 8C, and follicle cells start to divide."

"oogenesis stage S3 (fruit fly)"

"Oogenesis stage that begins when the oocyte chromosomes condense into a karyosome attached to a distinctive spherical structure known as an endobody. The oocyte nucleolus disappears completely. During this stage, nurse cell ploidy reaches 16C."

"oogenesis stage S4 (fruit fly)"

"Oogenesis stage that begins when the nurse cells chromosomes become bulbous. Nurse cell chromosomes during this stage are polytene and reach a ploidy of 32C. The egg chamber is oval shaped."

"oogenesis stage S5 (fruit fly)"

"Oogenesis stage that begins when nurse cell chromosomes are no longer bulbous - the association between homologs weakens so that these chromosomes no longer have a polytene structure. During this stage, posterior nurse cell nuclei have a higher ploidy (64C) than anterior ones."

"oogenesis stage S6 (fruit fly)"

"Oogenesis stage during which follicle cell division ceases."

"oogenesis stage S7 (fruit fly)"

"Oogenesis stage during which polyploidation and enlargement of follicle cells begins. Nurse cell ploidy ranges from 256C (anterior) to 512C (posterior) and the egg chamber gains an elongated shape."

"oogenesis stage S8 (fruit fly)"

"Oogenesis stage which begins when yolk first appears in the oocyte. Follicle cell migration over the oocyte begins during this stage (although mostly occurs during stage 9)."

"oogenesis stage S9 (fruit fly)"

"Oogenesis stage that begins when the border cells begin to migrate. During this stage: the oocyte is about 1/3 the length of the egg chamber with its nucleus located antero-dorsally; follicle cell migration results in an anterior to posterior gradient of follicle cell thickness with posterior cells being thicker (-> columnar) and posterior cells thinner ( -> squamous); border cell migration begins and ends; secretion of vitelline membrane begins."

"oogenesis stage S10 (fruit fly)"

"Oogenesis stage that begins when all the oocyte associated follicular epithelium is columnar and all of the nurse cell associated follicular epithelium is completely squamous and ends with the beginning of nurse cell dumping."

"oogenesis stage S10A (fruit fly)"

"Oogenesis stage which begins when all the oocyte associated follicular epithelium is columnar and all of the nurse cell associated follicular epithelium is completely squamous and ends when centripetal follicle migration begins. During this stage, the migrating border cells reach the oocyte. The oocyte is about 50% egg chamber length."

"oogenesis stage S10B (fruit fly)"

"Oogenesis stage that begins when the centripetal follicle cells begin to migrate. As a result, the vitelline membrane extends into the opercular region. This stage ends when nurse cell dumping begins."

"oogenesis stage S11 (fruit fly)"

"Oogenesis stage that begins when nurse cell dumping begins and development of the wax layer begins. The dorsal appendages begin to form during this stage. This stage ends when dying nurse cells form an anterior cap to the oocyte."

"oogenesis stage S12 (fruit fly)"

"Oogenesis stage that begins when dying nurse cells form an anterior cap to the oocyte. Shortly after this, nurse cell dumping and growth of the oocyte are complete. Elongation of the dorsal appendages and formation of the innermost chorionic layer and endochorion begins during this stage."

"oogenesis stage S12A (fruit fly)"

"Innermost chorionic layer and endochorion begin to form in the anterior of the follicle."

"oogenesis stage S12B (fruit fly)"

"Secretion of innermost chorionic layer and endochorion begins in the main follicle cells."

"oogenesis stage S12C (fruit fly)"

"Formation of specialized endochorion structures in the anterior of the follicle: branches in the developing dorsal appendages; compact endochorion lacking the pillars seen in the rest of the follicle."

"oogenesis stage S13 (fruit fly)"

"Oogenesis stage that begins when the micropyle begins to form. At the beginning of this stage, about 12-15 nurse cell nuclei remain at the anterior of the oocyte. By the end of this stage, none of these nuclei remain. Oocyte meiosis up to arrest at full metaphase I occurs during this stage."

"oogenesis stage S13A (fruit fly)"

"Oogenesis stage during which 12-15 nurse cell nuclei remain at the anterior of the oocyte. At this stage, the oocyte nucleus has reached its maximum volume and its chromosomes are compressed into a 5-7 micrometer karyosome."

"oogenesis stage S13B (fruit fly)"

"Oogenesis stage during which 9-11 nurse cell nuclei remain at the anterior of the oocyte. During this stage, the nuclear membrane of the oocyte nucleus disappears, indicating the start of meiotic pro-metaphase."

"oogenesis stage S13C (fruit fly)"

"Oogenesis stage during which only 7-8 nurse cell nuclei remain at the anterior of the oocyte. At the beginning of this stage, oocyte chromosome bivalents separate from each other - indicating mid-prometaphase of oocyte meiosis."

"oogenesis stage S13D (fruit fly)"

"Oogenesis stage during which only 5-6 nurse cell nuclei remain at the anterior of the oocyte. The oocyte nucleus is in late prometaphase:the bivalents arrange themselves in on the equatorial plane of the spindle; homologous centromeres are pulled towards the poles."

"oogenesis stage S14 (fruit fly)"

"The last stage of oogenesis. This stage begins when no nurse cell nuclei remain at the anterior of the egg (chamber). Exochorion formation and secretion occurs during this stage. The dorsal appendages complete their elongation and the follicle cells die."

"oogenesis stage S14A (fruit fly)"

"Secretion and formation of the outer endochorionic network by throughout the follicle. Crystallization of the innermost chorionic layer of the main body follicle cells."

"oogenesis stage S14B (fruit fly)"

"Secretion of the exochorion begins and ends."

"egg stage (fruit fly)"

"The stage of the Drosophila life-cycle from maturation of an egg to the end of fertilization. At the beginning of this stage, the nucleus is arrested in meiotic metaphase I. The completion of meiosis and the start of protein synthesis are triggered by ovulation. If the female has already mated, fertilization begins during meiosis."

"pre-blastoderm stage (fruit fly)"

"Embryonic stage 1-3."

"embryonic stage 1 (fruit fly)"

"The embryonic stage that lasts from the end of fertilization to the end of the second nuclear division. Duration at 25 degrees C: approximately 25 minutes (0-25 minutes after egg laying)."

"embryonic cycle 1 (fruit fly)"

"The first mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic stage 2 (fruit fly)"

"Nuclear divisions 3-8. The egg cytoplasm contracts producing a clear separation from the vitelline membrane and empty spaces at the anterior and posterior. The cleavage nuclei migrate towards the periphery. Duration at 25 degrees C approximately 40 minutes (25-65 minutes AEL)."

"embryonic cycle 2 (fruit fly)"

"The second mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 3 (fruit fly)"

"The third mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 4 (fruit fly)"

"The fourth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 5 (fruit fly)"

"The fifth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 6 (fruit fly)"

"The sixth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 7 (fruit fly)"

"The seventh mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 8 (fruit fly)"

"The eighth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic stage 3 (fruit fly)"

"Nuclear division 9. The cleavage nuclei complete their migration to the periphery. Polar buds form at the posterior pole and divide once. Duration at 25 degrees C: approximately 15 minutes (65-80 minutes after egg laying)."

"embryonic cycle 9 (fruit fly)"

"The ninth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 10 (fruit fly)"

"The tenth mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic stage 4 (fruit fly)"

"Nuclear division 10-13. Polar buds divide twice and become tightly grouped at the posterior pole by the end of this stage. Nuclei visible at the rim of the embryo. Stage 4 ends with the beginning of cellularization. Duration at 25 degrees C: approximately 50 minutes (80-130 minutes after egg laying)."

"embryonic cycle 11 (fruit fly)"

"The 11th mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 12 (fruit fly)"

"The 12th mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic cycle 13 (fruit fly)"

"The 13th mitotic cell cycle of embryogenesis. This occurs synchronously across the embryo."

"embryonic stage 5 (fruit fly)"

"Cellularization. Stage 5 begins when cellularization starts. Near the end of this stage the pole cells begin to migrate dorsally and ventral midline cells acquire an irregular, wavy appearance. Stage 5 ends when ventral furrow formation becomes apparent. Duration at 25 degrees: approximately 40 minutes (130-170 minutes after egg laying)."

"embryonic cycle 14 (fruit fly)"

"The 14th mitotic cell cycle of embryogenesis. This is the first round of nuclear division to occur in a cellularized embryo, so this is the first round of cell division. Embryonic cycle 14 mitosis is asynchronous across the embryo, but occurs synchronously within discrete domains, known as mitotic domains."

"embryonic cycle 14A (fruit fly)"

"The interphase of embryonic cycle 14. This begins at the same time as cellularization and is of variable length depending on cell identity: embryonic cycle 14 M phase (14B) is asynchronous across the embryo, but occurs synchronously within discrete domains, known as mitotic domains."

"embryonic cycle 14B (fruit fly)"

"The M-phase of embryonic cycle 14. This is asynchronous across the embryo, but occurs synchronously within discrete domains, known as mitotic domains."

"embryonic cycle 15 (fruit fly)"

"The 15th cell cycle of embryogenesis. Asynchronous."

"embryonic cycle 16 (fruit fly)"

"The 16th cell cycle division of embryogenesis. Asynchronous."

"embryonic stage 6 (fruit fly)"

"Stage 6 begins when the ventral furrow becomes apparent, an event which is followed rapidly by the formation of the cephalic furrow. Stage 6 ends when the pole cells have adopted a dorsal (horizontal) position at the posterior. Duration at 25 degrees C: approximately 10 minutes (170-180 minutes after egg laying)."

"embryonic stage 7 (fruit fly)"

"Stage 7 begins when the pole cells have adopted a dorsal (horizontal) position at the posterior. Invagination of the anterior and posterior midgut and hindgut follows. The 'discoid plate' that carries the pole cells forms a pocket. Transverse furrows (dorsal folds) form on the dorsal surface. This stage ends when the anterior wall of the amnioproctodeal invagination starts moving anteriorly and the pole cells are no longer visible externally. Duration at 25 degrees C: approximately 10 minutes (180-190 minutes after egg laying)."

"embryonic stage 8 (fruit fly)"

"Stage 8 starts with the rapid phase of germ band extension and ends with the beginning of mesodermal segmentation. By the end of this stage germ band extension has progressed to the point where the proctodeal opening is at about 60% egg length and the dorsal folds (transverse furrows) are no longer visible. Duration at 25 degrees C: approximately 30 minutes (190-220 minutes after egg laying)."

"embryonic stage 9 (fruit fly)"

"Stage 9 begins when mesodermal segmentation becomes (transiently) visible\, and ends with the appearance of the stomodeal invagination slightly ventral to the anterior pole. Duration at 25 degrees C: approximately 40 minutes (220-260 minutes after egg laying)."

"embryonic stage 10 (fruit fly)"

"Stage 10 begins with the appearance of the stomodeal invagination, slightly ventral to the anterior pole. Periodic furrows appear in the embryonic epidermis around the middle of the stage. The germ band continues to extend, reaching its maximum extent of 75% egg length towards the end of the stage. The end of the stage is marked by the beginning of invagination of the tracheal placodes. Duration at 25 degrees : approximately 60 minutes (260-320 minutes after egg laying)."

"embryonic stage 11 (fruit fly)"

"Stage 11 begins with the invagination of the tracheal placodes. Para-segmental furrow form and segment boundary furrows become deep folds. Within the head, gnathal protuberances become apparent. The end of this stage is signaled by the appearance of a distinct cleft at the posterior pole of the embryo, which becomes detached from the vitelline membrane. This marks the beginning of germ-band retraction. Duration at 25 degrees C: approximately 120 minutes (320-440 minutes after egg laying)."

"embryonic stage 12 (fruit fly)"

"Germ band retraction. Stage 12 begins when germ-band retraction starts and ends when this process is complete so that the prospective anal plate occupies the posterior pole. During this stage the posterior and anterior midgut primordia meet and fuse and the tracheal pits fuse to form the tracheal tree. Duration at 25 degrees C: approximately 120 minutes (440-560 minutes after egg laying)."

"embryonic stage 13 (fruit fly)"

"Stage 13 begins at the completion of germ-band retraction, when the prospective anal plate occupy the posterior pole. The dorsal ridge becomes apparent externally; the clypeolabrum retracts, leaving a triangular shaped gap at the anterior pole; the labium moves to the ventral midline. This stage ends when head involution begins. Duration at 25 degrees C: Approximately 60 minutes (560-620 minutes after egg laying)."

"embryonic stage 14 (fruit fly)"

"Stage 14 begins with the initiation of head involution. Closure of the midgut around the yolk and dorsal closure continue. Dorsal closure is 80% complete by the end of this stage. This stage ends with the appearance of the second midgut constriction. Duration at 25 degrees C: approximately 60 minutes (620-680 minutes after egg laying)."

"embryonic stage 15 (fruit fly)"

"Stage 15 begins with the appearance of the second midgut constriction. During this stage the 1st and 3rd midgut constrictions form, dorsal closure is completed, and epidermal segmentation is accomplished. This stage ends when the intersegmental grooves can be distinguished at mid-dorsal level. Duration at 25 degrees C: approximately 100 minutes (680-780 minutes after egg laying)."

"embryonic stage 16 (fruit fly)"

"Stage 16 begins when the intersegmental grooves can be distinguished at mid-dorsal level, and ends when the dorsal ridge (frontal sac) has overgrown the tip of the clypeolabrum, which is thereby enclosed in the atrium. During this stage the ventral cord retracts to about 60% egg length. Duration at 25 degrees C: approximately 180 minutes (780-960 minutes after egg laying)."

"embryonic stage 17 (fruit fly)"

"Stage 17 begins when the dorsal ridge (frontal sac) has overgrown the tip of the clypeolabrum, which is thereby enclosed in the atrium. It lasts until hatching of the embryo (approximately 24 hours after egg laying), during which time much terminal differentiation occurs, the tracheal tree fills with air, so becoming completely visible, and the ventral cord continues to retract. Duration at 25 degrees C: approximately 8 hours (16-24 hours after egg laying)."

"first instar larval stage (fruit fly)"

"The first larval instar begins at hatching and ends at the first larval molt. Anterior spiracles are not yet present; posterior spiracles have two openings each. Salivary glands are very small and all cells are uniform in size. Mouth hooks typically have one tooth. Duration at 25 degrees C: approximately 25 hours (24-49 hours after egg laying; 0-25 hours after hatching)."

"second instar larval stage (fruit fly)"

"The second larval instar begins at the first larval molt and ends at the second larval molt. Larvae are actively feeding and crawling in the food. Distinct anterior spiracles are present as enlargements at the end of the tracheal trunk, but not open to the outside; posterior spiracles have three openings each, and four groups of small unbranched hairs. The salivary glands extend to the first abdominal segment, and have cells that are uniform in size. Mouth hooks typically have two or three teeth. Duration at 25 degrees C: approximately 23 hours (49-72 hours after egg laying; 25-48 hours after hatching)."

"third instar larval stage (fruit fly)"

"The third larval instar begins at the second larval molt and ends at puparium formation. Anterior spiracles are open to the outside; posterior spiracles have three openings each, and four groups of large branched hairs. The salivary glands extend to the second abdominal segment, with cells larger in the posterior than in the anterior of the gland. Mouth hooks typically have 9-12 teeth. About 24 hours before pupariation (at 25 degree C), larvae stop feeding and climb away from their food. Duration at 25 degrees C: approximately 48 hours (72-120 hours after egg laying; 48-96 hours after hatching)."

"early third instar larval stage (fruit fly)"

"Third instar larva prior to the wandering stage (approximately the first 24 hours of the third instar larval stage under standard conditions at 25'C.)."

"wandering third instar larval stage (fruit fly)"

"Stage of the third larval instar during which the larva wanders out of the food and climbs. Under optimum conditions at 25'C, this occurs approximately 24 hours after the start of the third instar larval stage."

"prepupal stage (fruit fly)"

"The prepupal stage begins at puparium formation and ends when larval/pupal apolysis is complete, as indicated by the completion of imaginal head sac eversion and the expulsion of the oral armature of the larva. Duration at 25 degrees C: approximately 12 hours. (120-132.2 hours after egg laying; 0-12.2 hours after puparium formation)."

"prepupal stage P1 (fruit fly)"

"Extends from puparium formation through tanning of the pupal cuticle. Posterior spiracles and ridge between anterior spiracles tan orange. Wriggling stops completely. Puparium becomes brown to the unaided eye. Duration at 25 degrees C: approximately 20 minutes. (120-120.3 hours after egg laying; 0-0.3 hours after puparium formation)."

"prepupal stage P2 (fruit fly)"

"Male gonads become less distinct. Oral armature stops moving permanently. Dorsal medial abdominal contractions stop. Gas bubble becomes visible within abdomen. Duration at 25 degrees C: approximately 100 minutes. (120.3-122 hours after egg laying; 0.3-2 hours after puparium formation)."

"prepupal stage P3 (fruit fly)"

"Ridge of the operculum becomes distinct. Puparium begins to separate from underlying epidermis. Becomes positively buoyant. Duration at 25 degrees C: approximately 4 hours, 45 minutes. (122-126.75 hours after egg laying; 2-6.75 hours after puparium formation)."

"prepupal stage P4 (fruit fly)"

"Prepupal stage P4 begins as the lateral trunk trachea become obscured and ends when the imaginal head sac is everted and the oral armature of the larva is expelled. Duration at 25 degrees C: approximately 5 hours, 30 minutes. (126.75-132.2 hours after egg laying; 6.75-12.2 hours after puparium formation)."

"prepupal stage P4(i) (fruit fly)"

"Lateral trunk tracheae become obscured. Dorsal medial abdominal contractions occur. Everted leg and wing discs become visible. Bubble appears in posterior of puparium, displacing the pupa anteriorly; abdominal bubble disappears. Duration at 25 degrees C: approximately 5 hours, 15 minutes. (126.75-132 hours after egg laying; 6.75-12 hours after puparium formation)."

"prepupal stage P4(ii) (fruit fly)"

"Bubble is displaced to anterior end of the puparium, and pupa withdraws to the posterior end. Imaginal head sac is everted and the oral armature of the larva is expelled. Duration at 25 degrees C: approximately 12 minutes. (132-132.2 hours after egg laying; 12-12.2 hours after puparium formation)."

"pupal stage P5 (fruit fly)"

"Pupal stage P5 starts when the legs and wings reach full extension along the abdomen and ends as the Malpighian tubules become prominent and green. Duration at 25 degrees C: approximately 6 hours, 30 minutes. (132.2-138.7 hours after egg laying; 12.2-18.7 hours after puparium formation)."

"pupal stage P5(i) (fruit fly)"

"Legs and wings reach full extension along abdomen. Enlarged initial segments of anterior pair Malpighian tubules move from thorax into abdomen. Translucent patch that lacks adhering fat body cells becomes discernible in the middle of the eye region. Pair of white Malpighian tubules becomes visible dorsally in the abdomen. Duration at 25 degrees C: approximately 66 minutes. (132.2-133.3 hours after egg laying; 12.2-13.3 hours after puparium formation)."

"pupal stage P5(ii) (fruit fly)"

"Malpighian tubules become prominent and green. Duration at 25 degrees C: approximately 5 hours, 25 minutes. (133.3-138.7 hours after egg laying; 13.3-18.7 hours after puparium formation)."

"pupal stage P6 (fruit fly)"

"Dark green 'yellow body' appears between the anterior ends of the two Malpighian tubule segments, mid-dorsally at the anterior of the abdomen. Duration at 25 degrees C: approximately 13 hours, 45 minutes. (138.7-152.4 hours after egg laying; 18.7-32.4 hours after puparium formation)."

"pupal stage P7 (fruit fly)"

"The 'yellow body' moves back between the Malpighian tubules. The transparent pupal cuticle separates from the underlying epidermis. Eye cup becomes yellow at its perimeter. Duration at 25 degrees C: approximately 12 hours. (152.4-164.3 hours after egg laying; 32.4-44.3 hours after puparium formation)."

"pharate adult stage P8 (fruit fly)"

"Pale yellow pigmentation spreads inwards across the eye. Eye color becomes bright yellow, then changes to amber. Duration at 25 degrees C: approximately 12 hours 20 minutes. (164.3-176.6 hours after egg laying; 44.3-56.6 hours after puparium formation)."

"pharate adult stage P9 (fruit fly)"

"Eye color darkens to deep amber, then becomes pale pink. Duration at 25 degrees C: approximately 18 hours. (176.6-194.5 hours after egg laying; 56.6-74.5 hours after puparium formation)."

"pharate adult stage P10 (fruit fly)"

"Eyes become bright red. Orbital and ocellar bristles and vibrissae darken. Duration at 25 degrees C: approximately 6 minutes. (194.5-194.6 hours after egg laying; 74.5-74.6 hours after puparium formation)."

"pharate adult stage P11 (fruit fly)"

"Thoracic bristles become visible, and the tips of the wings turn grey. Duration at 25 degrees C: approximately 2 hours. (194.6-196.6 hours after egg laying; 74.6-76.6 hours after puparium formation)."

"pharate adult stage P11(i) (fruit fly)"

"Dorsal thoracic microchaetes and macrochaetes become visible. Duration at 25 degrees C: approximately 80 minutes (194.6-195.5 hours after egg laying; 74.6-75.9 hours after puparium formation)."

"pharate adult stage P11(ii) (fruit fly)"

"Tips of folded wings become grey. Duration at 25 degrees C: approximately 45 minutes (195.5-196.6 hours after egg laying; 75.9-76.6 hours after puparium formation)."

"pharate adult stage P12 (fruit fly)"

"Pharate adult stage P12 begins as the abdominal tergite bristles become visible, and ends as the wings darken to black. Duration at 25 degrees C: approximately 2 hours. (196.6-198.6 hours after egg laying; 76.6-78.6 hours after puparium formation)."

"pharate adult stage P12(i) (fruit fly)"

"Bristles of the abdominal tergites become visible, and the wings become grey. Duration at 25 degrees C: approximately 55 minutes. (196.6-197.5 hours after egg laying; 76.6-77.5 hours after puparium formation)."

"pharate adult stage P12(ii) (fruit fly)"

"Sex combs darken in males. Wings darken to black. Duration at 25 degrees C: approximately 65 minutes. (197.5-198.6 hours after egg laying; 77.5-78.6 hours after puparium formation)."

"pharate adult stage P13 (fruit fly)"

"Tarsal bristles darken and claws become black. Duration at 25 degrees C: approximately 3 hours, 20 minutes. (198.6-201.9 hours after egg laying; 78.6-81.9 hours after puparium formation)."

"pharate adult stage P14 (fruit fly)"

"The meconium appears dorsally at the posterior tip of the abdomen. Duration at 25 degrees C: approximately 9 hours, 30 minutes (201.9-211.5 hours after egg laying; 81.9-91.5 hours after puparium formation)."

"pharate adult stage P15 (fruit fly)"

"Pharate adult stage P15 begins with the tanning of the tergites and ends with eclosion. Duration at 25 degrees C: approximately 8 hours, 30 minutes. (211.5-220 hours after egg laying; 91.5-100 hours after puparium formation)."

"pharate adult stage P15(i) (fruit fly)"

"Tanning of the tergites obscures the Malpighian tubules and the 'yellow body'. Legs begin to twitch; fly is able to walk if puparium is removed prematurely. Ptilinum expands by hydrostatic pressure, opening the operculum. Duration at 25 degrees C: approximately 8 hours, 6 minutes. (211.5-219.6 hours after egg laying; 91.5-99.6 hours after puparium formation)."

"pharate adult stage P15(ii) (fruit fly)"

"Stage which starts when the operculum opens and ends when eclosion is completed. Duration at 25 degrees C: approximately 24 minutes. (219.6-220 hours after egg laying; 99.6-100 hours after puparium formation)."

"adult stage A1 (fruit fly)"

"Newly eclosed adult stage. Animal free of pupal case. Runs rapidly to find site for wing expansion. Wings are folded back and black against a very pale abdomen."

"adult stage A2 (fruit fly)"

"Stage, shortly after eclosion, during which the wings expand. During wing expansion, the abdomen pulsates and the hind legs stroke the wings vigorously for several minutes at a time. The stage ends when the wings are folded down over the abdomen, which has become broader and shorter, and the wing cuticle has lost its folds. The stage lasts around 15 minutes at 25'C."

"pharate adult stage (fruit fly)"

"The developing adult after pupal-adult apolysis, i.e.- from stage P8 (when yellow eye color first becomes visible through the pupal case), to eclosion. Duration at 25 degrees C: approximately 55.7 hours (164.3-220 hours after egg laying; 44.3-100 hours after puparium formation)."

"adult stage A3 (fruit fly)"

"Adult stage immediately after wing expansion, during which tanning of the cuticle is completed. This stage lasts approximately 45 minutes at 25'C."

"oogenesis stage S11a (fruit fly)"

"Oogenesis stage that begins when nurse cell dumping begins and development of the wax layer begins and ends when the dorsal appendages begin to form."

"oogenesis stage S11b (fruit fly)"

"Oogenesis stage that begins when endochorion begins to form at the anterior pole, a process which includes the beginning of formation of the dorsal appendages. During this stage, the follicle cells secrete membranous vesicles that form irregular extracellular plaques. This stage ends when dying nurse cells form an anterior cap to the oocyte."

"third instar larval stage L1 (fruit fly)"

"Stage which begins when wandering third instar larva stops crawling. The larva everts its anterior spiracles during this stage."

"third instar larval stage L2 (fruit fly)"

"The anterior spiracles are fully everted, with 7-9 finger-like projections. The body shortens, withdrawing three apparent abdominal segments and the larva sticks to its substrate."

"oogenesis stage S13E (fruit fly)"

"Oogenesis stage during which the number of nurse cell nuclei at the anterior of the oocyte reduce from 4 to zero. The oocyte chromosomes reach full metaphase I during this stage, at which point meiosis is arrested (until fertilization)."

"late third instar larval stage (fruit fly)"

"Third instar larva from the beginning of wandering to the beginning of puparium formation."

"embryonic stage 17(i) (fruit fly)"

"The first two hours of embryonic stage 17 at 25'C. (Approximately 16-18 hours at 25'C after egg laying)."

"embryonic stage 17(ii) (fruit fly)"

"Hours 2-4 of embryonic stage 17 at 25'C. (Approximately 18-20 hours at 25'C after egg laying)."

"embryonic stage 17(iii) (fruit fly)"

"Hours 4-6 of embryonic stage 17 at 25'C. (Approximately 20-22 hours at 25'C after egg laying)."

"embryonic stage 17(iv) (fruit fly)"

"Hours 6-8 (the last two hours) of embryonic stage 17 at 25'C. (Approximately 22-24 hours at 25'C after egg laying)."

"third instar - uncleared gut stage (fruit fly)"

"The substage of the wandering third instar larval stage, prior to the beginning of clearance of the gut."

"third instar - partially cleared gut stage (fruit fly)"

"The substage of the wandering third instar larval stage when the larva has partially cleared its gut contents."

"third instar - cleared gut stage (fruit fly)"

"The substage of the wandering third instar larval stage when the larva has cleared its gut contents."

"immature adult stage (fruit fly)"

"The developmental stage that lasts from eclosion of the adult from the pupal case until tanning is complete (the end of adult stage A3)."

"mature adult stage (fruit fly)"

"Life stage from the end of adult stage A3, when tanning is complete, to death."

"day 0 of adulthood (fruit fly)"

"The day of eclosion."

"day 1 of adulthood (fruit fly)"

"1st day after eclosion."

"day 2 of adulthood (fruit fly)"

"2nd day after eclosion."

"day 3 of adulthood (fruit fly)"

"3rd day after eclosion."

"day 4 of adulthood (fruit fly)"

"4th day after eclosion."

"day 5 of adulthood (fruit fly)"

"5th day after eclosion."

"day 6 of adulthood (fruit fly)"

"6th day after eclosion."

"day 7 of adulthood (fruit fly)"

"7th day after eclosion."

"day 8 of adulthood (fruit fly)"

"8th day after eclosion."

"day 9 of adulthood (fruit fly)"

"9th day after eclosion."

"day 10 of adulthood (fruit fly)"

"10th day after eclosion."

"day 11 of adulthood (fruit fly)"

"11th day after eclosion."

"day 12 of adulthood (fruit fly)"

"12th day after eclosion."

"day 13 of adulthood (fruit fly)"

"13th day after eclosion."

"day 14 of adulthood (fruit fly)"

"14th day after eclosion."

"day 15 of adulthood (fruit fly)"

"15th day after eclosion."

"day 16 of adulthood (fruit fly)"

"16th day after eclosion."

"day 17 of adulthood (fruit fly)"

"17th day after eclosion."

"day 18 of adulthood (fruit fly)"

"18th day after eclosion."

"day 19 of adulthood (fruit fly)"

"19th day after eclosion."

"day 20 of adulthood (fruit fly)"

"20th day after eclosion."

"day 21 of adulthood (fruit fly)"

"21st day after eclosion."

"day 22 of adulthood (fruit fly)"

"22nd day after eclosion."

"day 23 of adulthood (fruit fly)"

"23rd day after eclosion."

"day 24 of adulthood (fruit fly)"

"24th day after eclosion."

"day 25 of adulthood (fruit fly)"

"25th day after eclosion."

"day 26 of adulthood (fruit fly)"

"26th day after eclosion."

"day 27 of adulthood (fruit fly)"

"27th day after eclosion."

"day 28 of adulthood (fruit fly)"

"28th day after eclosion."

"day 29 of adulthood (fruit fly)"

"29th day after eclosion."

"day 30 of adulthood (fruit fly)"

"30th day after eclosion."

"day 31 of adulthood (fruit fly)"

"31st day after eclosion."

"day 32 of adulthood (fruit fly)"

"32nd day after eclosion."

"day 33 of adulthood (fruit fly)"

"33rd day after eclosion."

"day 34 of adulthood (fruit fly)"

"34th day after eclosion."

"day 35 of adulthood (fruit fly)"

"35th day after eclosion."

"day 36 of adulthood (fruit fly)"

"36th day after eclosion."

"day 37 of adulthood (fruit fly)"

"37th day after eclosion."

"day 38 of adulthood (fruit fly)"

"38th day after eclosion."

"day 39 of adulthood (fruit fly)"

"39th day after eclosion."

"day 40 of adulthood (fruit fly)"

"40th day after eclosion."

"day 41 of adulthood (fruit fly)"

"41st day after eclosion."

"day 42 of adulthood (fruit fly)"

"42nd day after eclosion."

"day 43 of adulthood (fruit fly)"

"43rd day after eclosion."

"day 44 of adulthood (fruit fly)"

"44th day after eclosion."

"day 45 of adulthood (fruit fly)"

"45th day after eclosion."

"day 46 of adulthood (fruit fly)"

"46th day after eclosion."

"day 47 of adulthood (fruit fly)"

"47th day after eclosion."

"day 48 of adulthood (fruit fly)"

"48th day after eclosion."

"day 49 of adulthood (fruit fly)"

"49th day after eclosion."

"day 50 of adulthood (fruit fly)"

"50th day after eclosion."

"day 51 of adulthood (fruit fly)"

"51st day after eclosion."

"day 52 of adulthood (fruit fly)"

"52nd day after eclosion."

"day 53 of adulthood (fruit fly)"

"53rd day after eclosion."

"day 54 of adulthood (fruit fly)"

"54th day after eclosion."

"day 55 of adulthood (fruit fly)"

"55th day after eclosion."

"day 56 of adulthood (fruit fly)"

"56th day after eclosion."

"day 57 of adulthood (fruit fly)"

"57th day after eclosion."

"day 58 of adulthood (fruit fly)"

"58th day after eclosion."

"day 59 of adulthood (fruit fly)"

"59th day after eclosion."

"day 60 of adulthood (fruit fly)"

"60th day after eclosion."

"early extended germ band stage (fruit fly)"

"A collective term for stages 9 and 10."

"hatchling stage (chicken)"

"Chicken developmental stage that covers the period from hatching until 4 weeks old, during which individuals have no feathers."

"1-year-old stage (chicken)"

"Mature stage that refers to a chicken who is over 12 and under 24 months old."

"Hamburger Hamilton stage 1 (chicken)"

"Prenatal stage starting the incubation period and usually defined by the presence of the primitive streak (embryonic shield)."

"Hamburger Hamilton stage 3 (chicken)"

"Prenatal stage on incubation period defined by the intermediate primitive streak, while no primitive groove is visible."

"Hamburger Hamilton stage 4 (chicken)"

"Prenatal stage on incubation period defined by the definitive primitive streak, about 1.88 mm long. Primitive groove, primitive pir, Hensen's node are present. "

"Hamburger Hamilton stage 7 (chicken)"

"Prenatal stage on incubation period defined by the first somite and coelom, then up to 3 somites and neural folds."

"Hamburger Hamilton stage 8 (chicken)"

"Prenatal stage on incubation period defined by 4 somites and blood islands."

"Hamburger Hamilton stage 9 (chicken)"

"Prenatal stage on incubation period defined by 7 somites and primary optic vesicles."

"Hamburger Hamilton stages 9+ to 10- (chicken)"

"Prenatal stage on incubation period defined by 8-9 somites and anterior amniotic fold."

"Hamburger Hamilton stage 10 (chicken)"

"Prenatal stage on incubation period defined by 10 somites and 3 primary brain vesicles."

"Hamburger Hamilton stage 11 (chicken)"

"Prenatal stage on incubation period defined by 13 somites and 5 neuromeres of hindbrain."

"Hamburger Hamilton stage 12 (chicken)"

"Prenatal stage on incubation period defined by 16 somites and telencephalon ."

"Hamburger Hamilton stage 13 (chicken)"

"Prenatal stage on incubation period defined by 19 somites and atrioventricular canal ."

"Hamburger Hamilton stages 13+ to 14- (chicken)"

"Prenatal stage on incubation period defined by 20-21 somites and tail bud."

"Hamburger Hamilton stage 14 (chicken)"

"Prenatal stage on incubation period defined by 22 somites, trunk flexure, visceral arches I and II, clefts 1 and 2."

"Hamburger Hamilton stages 14+ to 15- (chicken)"

"Prenatal stage on incubation period defined by 23 somites and premandibular head cavities."

"Hamburger Hamilton stage 15 (chicken)"

"Prenatal stage on incubation period defined by 24-27 somites and visceral arch III, cleft 3."

"Hamburger Hamilton stage 16 (chicken)"

"Prenatal stage on incubation period defined by 226-28 somites, wing bud, posterior amniotic fold."

"Hamburger Hamilton stage 17 (chicken)"

"Prenatal stage on incubation period defined by 29-32 somites, leg bud and epiphysis."

"Hamburger Hamilton stage 18 (chicken)"

"Prenatal stage on incubation period defined by 30-36 somites extending beyond level of leg bud and allantois."

"Hamburger Hamilton stage 19 (chicken)"

"Prenatal stage on incubation period defined by 37- 40 somites extending into tail and maxillary process ."

"Hamburger Hamilton stage 20 (chicken)"

"Prenatal stage on incubation period defined by 40-43 somites, rotation completed, eye pigment."

"Hamburger Hamilton stage 21 (chicken)"

"Prenatal stage on incubation period defined by 43-44 somites, visceral arch IV, cleft 4."

"Hamburger Hamilton stage 22 (chicken)"

"Prenatal stage on incubation period defined by somites extending to tip of tail."

"Hamburger Hamilton stage 23 (chicken)"

"Prenatal stage on incubation period when dorsal contour from hindbrain to tail is a curved line."

"Hamburger Hamilton stage 24 (chicken)"

"Prenatal stage on incubation period defined by toe plate."

"Hamburger Hamilton stage 25 (chicken)"

"Prenatal stage on incubation period defined by elbow and knee joints."

"Hamburger Hamilton stage 26 (chicken)"

"Prenatal stage on incubation period defined by 1st 3 toes."

"Hamburger Hamilton stage 27 (chicken)"

"Prenatal stage on incubation period defined by beak."

"Hamburger Hamilton stage 28 (chicken)"

"Prenatal stage on incubation period defined by 3 digits, 4 toes."

"Hamburger Hamilton stage 29 (chicken)"

"Prenatal stage on incubation period defined by rudiment of 5th toe."

"Hamburger Hamilton stage 30 (chicken)"

"Prenatal stage on incubation period defined by feather germs, scleral papillae, egg tooth."

"Hamburger Hamilton stage 31 (chicken)"

"Prenatal stage on incubation period defined by web between 1st and 2nd digits."

"Hamburger Hamilton stage 32 (chicken)"

"Prenatal stage on incubation period when anterior tip of mandible has reached beak."

"Hamburger Hamilton stage 33 (chicken)"

"Prenatal stage on incubation period defined by web on radial margin of wing and 1st digit."

"Hamburger Hamilton stage 34 (chicken)"

"Prenatal stage on incubation period defined by nictitating membrane."

"Hamburger Hamilton stage 35 (chicken)"

"Prenatal stage on incubation period defined by phalanges in toes."

"Hamburger Hamilton stage 36 (chicken)"

"Prenatal stage on incubation period defined by length of 3rd toe from tip to middle of metatarsal joint = 5.4 �0.3 mm, length of beak from anterior angle of nostril to tip of bill = 2.5mm, primordium of comb, labial groove, uropygial gland."

"Hamburger Hamilton stage 37 (chicken)"

"Prenatal stage on incubation period defined by length of 3rd toe = 7.4 �0.3mm; length of beak = 3.0 mm."

"Hamburger Hamilton stage 38 (chicken)"

"Prenatal stage on incubation period defined by length of 3rd toe = 8.4 � 0.3 mm; length of beak = 3.1 mm."

"Hamburger Hamilton stage 39 (chicken)"

"Prenatal stage on incubation period defined by length of 3rd toe = 9.8 � 0.3 mm; length of beak = 3.5 mm."

"Hamburger Hamilton stage 40 (chicken)"

"Prenatal stage on incubation period defined by length of beak = 4.0 mm; length of 3rd toe = 12.7 � 0.5 mm."

"Hamburger Hamilton stage 41 (chicken)"

"Prenatal stage on incubation period defined by length of beak from anterior angle of nostril to tip of upper bill = 4.5 mm; length of 3rd toe = 14.9 � 0.8 mm."

"Hamburger Hamilton stage 42 (chicken)"

"Prenatal stage on incubation period defined by length of beak = 4.8 mm; length of 3rd toe = 16.7 � 0.8 mm."

"Hamburger Hamilton stage 43 (chicken)"

"Prenatal stage on incubation period defined by length of beak = 5.0 mm; length of 3rd toe = 18.6 � 0.8 mm."

"Hamburger Hamilton stage 44 (chicken)"

"Prenatal stage on incubation period defined by length of beak = 5.7 mm; length of 3rd toe = 20.4 � 0.8 mm."

"Hamburger Hamilton stage 45 (chicken)"

"Prenatal stage on incubation period defined by yolk sac half enclosed in body cavity, chorio-allantoic membrane containing less blood and 'sticky' in living embryo."

"Hamburger Hamilton stages 2 (chicken)"

"Prenatal stage on incubation period during which the initial primitive streak reaches a length of 0.3-0.5 mm."

"Hamburger Hamilton stages 5 (chicken)"

"Prenatal stage on incubation period defined by head process (notochord) formation."

"Hamburger Hamilton stages 6 (chicken)"

"Prenatal stage on incubation period defined by head fold formation."

"early cleavage stage (chicken)"

"Before laying stage during which the shell membrane of egg is formed in isthmus of oviduct."

"late cleavage stage (chicken)"

"Before laying stage during which the shell of egg is formed in uterus."

"1-day-old stage (chicken)"

"Immature chicken that is over 1 and under 2 days after hatching."

"2-day-old stage (chicken)"

"Immature chicken that is over 2 and under 3 days after hatching."

"3-day-old stage (chicken)"

"Immature chicken that is over 3 and under 4 days after hatching."

"4-day-old stage (chicken)"

"Immature chicken that is over 4 and under 5 days after hatching."

"5-day-old stage (chicken)"

"Immature chicken that is over 5 and under 6 days after hatching."

"6-day-old stage (chicken)"

"Immature chicken that is over 6 and under 7 days after hatching."

"1-week-old stage (chicken)"

"Immature chicken that is over 7 days and under 14 days after hatching."

"2-week-old stage (chicken)"

"Immature chicken that is over 2 and under 3 weeks after hatching."

"3-week-old stage (chicken)"

"Immature chicken that is over 3 and under 4 weeks after hatching."

"4-week-old stage (chicken)"

"Immature chicken that is over 4 and under 5 weeks after hatching."

"young adult stage (chicken)"

"Chicken developmental stage that refers to a chicken who is over 5 months and under 2 years old."

"middle adult stage (chicken)"

"Chicken developmental stage that refers to a chicken who is over 2 and under 4 years old."

"5-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 5 and under 6 months old."

"6-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 6 and under 7 months old."

"7-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 7 and under 8 months old."

"8-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 8 and under 9 months old."

"9-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 9 and under 10 months old."

"10-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 10 and under 11 months old."

"11-month-old stage (chicken)"

"Mature stage that refers to a chicken who is over 11 and under 12 months old."

"2-year-old stage (chicken)"

"Mature stage that refers to a chicken who is over 2 and under 3 years old."

"3-year-old stage (chicken)"

"Mature stage that refers to a chicken who is over 3 and under 4 years old."

"Hamburger Hamilton stage 46 (chicken)"

"Newly-hatched chick."

"30-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 30 and under 31 years old."

"31-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 31 and under 32 years old."

"32-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 32 and under 33 years old."

"33-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 33 and under 34 years old."

"34-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 34 and under 35 years old."

"35-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 35 and under 36 years old."

"36-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 36 and under 37 years old."

"37-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 37 and under 38 years old."

"38-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 38 and under 39 years old."

"39-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 39 and under 40 years old."

"40-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 40 and under 41 years old."

"41-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 41 and under 42 years old."

"42-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 42 and under 43 years old."

"43-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 43 and under 44 years old."

"44-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 44 and under 45 years old."

"45-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 45 and under 46 years old."

"46-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 46 and under 47 years old."

"47-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 47 and under 48 years old."

"48-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 48 and under 49 years old."

"49-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 49 and under 50 years old."

"50-year-old stage (gorilla)"

"Aged stage that refers to a gorilla who is over 50 and under 51 years old."

"51-year-old stage (gorilla)"

"Mature stage that refers to a gorilla who is over 51 and under 52 years old."

"52-year-old and over stage (gorilla)"

"Mature stage that refers to a gorilla who is over 52 years old."

"Carnegie stage 03 (human)"

"Blastula stage with the loss of the zona pellucida and the definition of a free blastocyst."

"Carnegie stage 04 (human)"

"Blastula stage during which the blastocyst becomes attached."

"Carnegie stage 05 (human)"

"Blastula stage during which implantation occurs."

"Carnegie stage 06 (human)"

"Gastrula stage during which the extraembryonic mesoderm and primitive streak appear."

"Carnegie stage 07 (human)"

"Neurula stage during which the notochordal process appears, and gastrulation is continuing."

"Carnegie stage 08 (human)"

"Neurula stage during which the primitive pit and the notochordal canal appear."

"Carnegie stage 09 (human)"

"Organogenesis stage during which somites 1-3 appear, and neural folds, cardiac primordium, and head fold are present."

"Carnegie stage 10 (human)"

"Organogenesis stage during which somites 4-12 appear, and the neural fold fuses."

"Carnegie stage 11 (human)"

"Organogenesis stage during which somites 13-20 appear, and the rostral neuropore closes."

"Carnegie stage 12 (human)"

"Organogenesis stage during which somites 21-29 appear, and the caudal neuropore closes."

"Carnegie stage 13 (human)"

"Organogenesis developmental stage during which somite 30 appears, and leg buds, lens placode, pharyngeal arches are present."

"Carnegie stage 14 (human)"

"Organogenesis stage during which lens pit and optic cup appear."

"Carnegie stage 15 (human)"

"Organogenesis stage during which lens vesicle, nasal pit, and hand plate appear."

"Carnegie stage 16 (human)"

"Organogenesis stage during which nasal pits moved ventrally, and features are auricular hillocks, and foot plate."

"Carnegie stage 17 (human)"

"Organogenesis stage during which finger rays become visible."

"Carnegie stage 18 (human)"

"Organogenesis stage during which ossification commences."

"Carnegie stage 19 (human)"

"Organogenesis stage during which the straightening of the trunk starts."

"Carnegie stage 20 (human)"

"Organogenesis stage during which upper limbs are longer and bent at elbow."

"Carnegie stage 21 (human)"

"Organogenesis stage during which hands and feet turned inward."

"Carnegie stage 22 (human)"

"Organogenesis stage during which eyelids and external ears appear."

"Carnegie stage 23 (human)"

"Organogenesis stage during which the head, the body, and the limbs are rounded structures."

"Carnegie stage 05a (human)"

"Carnegie developmental stage 5 defined by a solid trophoblast."

"Carnegie stage 05b (human)"

"Carnegie developmental stage 5 defined by a trophoblastic lacunae."

"Carnegie stage 05c (human)"

"Carnegie developmental stage 5 defined by a lacunar vascular circle."

"Carnegie stage 06a (human)"

"Carnegie developmental stage 6 during which chorionic villi appear."

"Carnegie stage 06b (human)"

"Carnegie developmental stage 6 during which the primitive streak appears."

"9th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 8 and under 9 weeks of development."

"10th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 9 and under 10 weeks of development."

"11th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 10 and under 11 weeks of development."

"12th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 11 and under 12 weeks of development."

"13th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 12 and under 13 weeks of development."

"14th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 13 and under 14 weeks of development."

"15th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 14 and under 15 weeks of development."

"16th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 15 and under 16 weeks of development."

"17th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 16 and under 17 weeks of development."

"18th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 17 and under 18 weeks of development."

"19th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 18 and under 19 weeks of development."

"20th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 19 and under 20 weeks of development."

"21st week post-fertilization stage (human)"

"Fetal stage when the fetus is over 20 and under 21 weeks of development."

"22nd week post-fertilization stage (human)"

"Fetal stage when the fetus is over 21 and under 22 weeks of development."

"23rd week post-fertilization stage (human)"

"Fetal stage when the fetus is over 22 and under 23 weeks of development."

"24th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 23 and under 24 weeks of development."

"25th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 24 and under 25 weeks of development."

"26th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 25 and under 26 weeks of development."

"27th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 26 and under 27 weeks of development."

"28th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 27 and under 28 weeks of development."

"29th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 28 and under 29 weeks of development."

"30th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 29 and under 30 weeks of development."

"31st week post-fertilization stage (human)"

"Fetal stage when the fetus is over 30 and under 31 weeks of development."

"32nd week post-fertilization stage (human)"

"Fetal stage when the fetus is over 31 and under 32 weeks of development."

"33rd week post-fertilization stage (human)"

"Fetal stage when the fetus is over 32 and under 33 weeks of development."

"34th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 33 and under 34 weeks of development."

"35th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 34 and under 35 weeks of development."

"36th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 35 and under 36 weeks of development."

"37th week post-fertilization stage (human)"

"Fetal stage when the fetus is over 36 and under 37 weeks of development."

"38th week post-fertilization and over stage (human)"

"Fetal stage when the fetus is over 37 weeks of development and until birth."

"80 year-old and over stage (human)"

"Aged stage that refers to an adult who is over 80 years old."

"2-year-old stage (human)"

"Child stage that refers to a child who is over 2 and under 3 years old."

"3-year-old stage (human)"

"Child stage that refers to a child who is over 3 and under 4 years old."

"4-year-old stage (human)"

"Child stage that refers to a child who is over 4 and under 5 years old."

"5-year-old stage (human)"

"Child stage that refers to a child who is over 5 and under 6 years old."

"6-year-old stage (human)"

"Child stage that refers to a child who is over 6 and under 7 years old."

"7-year-old stage (human)"

"Child stage that refers to a child who is over 7 and under 8 years old."

"8-year-old stage (human)"

"Child stage that refers to a child who is over 8 and under 9 years old."

"9-year-old stage (human)"

"Child stage that refers to a child who is over 9 and under 10 years old."

"10-year-old stage (human)"

"Child stage that refers to a child who is over 10 and under 11 years old."

"11-year-old stage (human)"

"Child stage that refers to a child who is over 11 and under 12 years old."

"12-year-old stage (human)"

"Child stage that refers to a child who is over 12 and under 13 years old."

"13-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 13 and under 14 years old."

"14-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 14 and under 15 years old."

"15-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 15 and under 16 years old."

"16-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 16 and under 17 years old."

"17-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 17 and under 18 years old."

"18-year-old stage (human)"

"Adolescent stage that refers to an adolescent who is over 18 and under 19 years old."

"19-year-old stage (human)"

"Young adult stage that refers to an adult who is over 19 and under 20 years old."

"20-year-old stage (human)"

"Young adult stage that refers to an adult who is over 20 and under 21 years old."

"21-year-old stage (human)"

"Young adult stage that refers to an adult who is over 21 and under 22 years old."

"22-year-old stage (human)"

"Young adult stage that refers to an adult who is over 22 and under 23 years old."

"23-year-old stage (human)"

"Young adult stage that refers to an adult who is over 23 and under 24 years old."

"24-year-old stage (human)"

"Young adult stage that refers to an adult who is over 24 and under 25 years old."

"25-year-old stage (human)"

"Adult stage that refers to an adult who is over 25 and under 26 years old."

"26-year-old stage (human)"

"Adult stage that refers to an adultwho is over 26 and under 27 years old."

"27-year-old stage (human)"

"Adult stage that refers to an adult who is over 27 and under 28 years old."

"28-year-old stage (human)"

"Adult stage that refers to an adult who is over 28 and under 29 years old."

"29-year-old stage (human)"

"Adult stage that refers to an adult who is over 29 and under 30 years old."

"30-year-old stage (human)"

"Adult stage that refers to an adult who is over 30 and under 31 years old."

"31-year-old stage (human)"

"Adult stage that refers to an adult who is over 31 and under 32 years old."

"32-year-old stage (human)"

"Adult stage that refers to an adult who is over 32 and under 33 years old."

"33-year-old stage (human)"

"Adult stage that refers to an adult who is over 33 and under 34 years old."

"34-year-old stage (human)"

"Adult stage that refers to an adult who is over 34 and under 35 years old."

"35-year-old stage (human)"

"Adult stage that refers to an adult who is over 35 and under 36 years old."

"36-year-old stage (human)"

"Adult stage that refers to an adult who is over 36 and under 37 years old."

"37-year-old stage (human)"

"Adult stage that refers to an adult who is over 37 and under 38 years old."

"38-year-old stage (human)"

"Adult stage that refers to an adult who is over 38 and under 39 years old."

"39-year-old stage (human)"

"Adult stage that refers to an adult who is over 39 and under 40 years old."

"40-year-old tage (human)"

"Adult stage that refers to an adult who is over 40 and under 41 years old."

"41-year-old stage (human)"

"Adult stage that refers to an adult who is over 41 and under 42 years old."

"42-year-old stage (human)"

"Adult stage that refers to an adult who is over 42 and under 43 years old."

"43-year-old stage (human)"

"Adult stage that refers to an adult who is over 43 and under 44 years old."

"44-year-old stage (human)"

"Adult stage that refers to an adult who is over 44 and under 45 years old."

"45-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 45 and under 46 years old."

"46-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 46 and under 47 years old."

"47-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 47 and under 48 years old."

"48-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 48 and under 49 years old."

"49-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 49 and under 50 years old."

"50-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 50 and under 51 years old."

"51-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 51 and under 52 years old."

"52-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 52 and under 53 years old."

"53-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 53 and under 54 years old."

"54-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 54 and under 55 years old."

"55-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 55 and under 56 years old."

"56-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 56 and under 57 years old."

"57-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 57 and under 58 years old."

"58-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 58 and under 59 years old."

"59-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 59 and under 60 years old."

"60-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 60 and under 61 years old."

"61-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 61 and under 62 years old."

"62-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 62 and under 63 years old."

"63-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 63 and under 64 years old."

"64-year-old stage (human)"

"Middle aged stage that refers to an adult who is over 64 and under 65 years old."

"65-year-old stage (human)"

"Adult stage that refers to an adult who is over 65 and under 66 years old."

"66-year-old stage (human)"

"Adult stage that refers to an adult who is over 66 and under 67 years old."

"67-year-old stage (human)"

"Adult stage that refers to an adult who is over 67 and under 68 years old."

"68-year-old stage (human)"

"Adult stage that refers to an adult who is over 68 and under 69 years old."

"69-year-old stage (human)"

"Adult stage that refers to an adult who is over 69 and under 70 years old."

"70-year-old stage (human)"

"Adult stage that refers to an adult who is over 70 and under 71 years old."

"71-year-old stage (human)"

"Adult stage that refers to an adult who is over 71 and under 72 years old."

"72-year-old stage (human)"

"Adult stage that refers to an adult who is over 72 and under 73 years old."

"73-year-old stage (human)"

"Adult stage that refers to an adult who is over 73 and under 74 years old."

"74-year-old stage (human)"

"Adult stage that refers to an adult who is over 74 and under 75 years old."

"75-year-old stage (human)"

"Adult stage that refers to an adult who is over 75 and under 76 years old."

"76-year-old stage (human)"

"Adult stage that refers to an adult who is over 76 and under 77 years old."

"77-year-old stage (human)"

"Adult stage that refers to an adult who is over 77 and under 78 years old."

"78-year-old stage (human)"

"Adult stage that refers to an adult who is over 78 and under 79 years old."

"79-year-old stage (human)"

"Adult stage that refers to an adult who is over 79 and under 80 years old."

"2-month-old stage (human)"

"Infant stage that refers to an infant who is over 2 and under 3 months old."

"3-month-old stage (human)"

"Infant stage that refers to an infant who is over 3 and under 4 months old."

"4-month-old stage (human)"

"Infant stage that refers to an infant who is over 4 and under 5 months old."

"5-month-old stage (human)"

"Infant stage that refers to an infant who is over 5 and under 6 months old."

"6-month-old stage (human)"

"Infant stage that refers to an infant who is over 6 and under 7 months old."

"7-month-old stage (human)"

"Infant stage that refers to an infant who is over 7 and under 8 months old."

"8-month-old stage (human)"

"Infant stage that refers to an infant who is over 8 and under 9 months old."

"9-month-old stage (human)"

"Infant stage that refers to an infant who is over 9 and under 10 months old."

"10-month-old stage (human)"

"Infant stage that refers to an infant who is over 10 and under 11 months old."

"11-month-old stage (human)"

"Infant stage that refers to an infant who is over 11 and under 12 months old."

"12-month-old stage (human)"

"Infant stage that refers to an infant who is over 12 and under 13 months old."

"13-month-old stage (human)"

"Infant stage that refers to an infant who is over 13 and under 14 months old."

"14-month-old stage (human)"

"Infant stage that refers to an infant who is over 14 and under 15 months old."

"15-month-old stage (human)"

"Infant stage that refers to an infant who is over 15 and under 16 months old."

"16-month-old stage (human)"

"Infant stage that refers to an infant who is over 16 and under 17 months old."

"17-month-old stage (human)"

"Infant stage that refers to an infant who is over 17 and under 18 months old."

"18-month-old stage (human)"

"Infant stage that refers to an infant who is over 18 and under 19 months old."

"19-month-old stage (human)"

"Infant stage that refers to an infant who is over 19 and under 20 months old."

"20-month-old stage (human)"

"Infant stage that refers to an infant who is over 20 and under 21 months old."

"21-month-old stage (human)"

"Infant stage that refers to an infant who is over 21 and under 22 months old."

"22-month-old stage (human)"

"Infant stage that refers to an infant who is over 22 and under 23 months old."

"23-month-old stage (human)"

"Infant stage that refers to an infant who is over 23 and under 24 months old."

"third LMP month stage (human)"

"Fetal stage that refers to the third month of gestation starting from the last menstrual period (LMP)."

"fourth LMP month stage (human)"

"Fetal stage that refers to the fourth month of gestation starting from the last menstrual period (LMP)."

"fifth LMP month stage (human)"

"Fetal stage that refers to the fifth month of gestation starting from the last menstrual period (LMP)."

"sixth LMP month stage (human)"

"Fetal stage that refers to the sixth month of gestation starting from the last menstrual period (LMP)."

"seventh LMP month stage (human)"

"Fetal stage that refers to the seventh month of gestation starting from the last menstrual period (LMP)."

"eighth LMP month stage (human)"

"Fetal stage that refers to the eighth month of gestation starting from the last menstrual period (LMP)."

"ninth LMP month stage (human)"

"Fetal stage that refers to the ninth month of gestation starting from the last menstrual period (LMP)."

"morula stage (human)"

"The morula stage is the later part of Carnegie stage 02 when the cells have coalesced into a mass but the blastocystic cavity has not formed. Formation of the cavity marks the beginning of Carnegie stage 03."

"80-year-old stage (human)"

"Aged stage that refers to an adult who is over 80 and under 81 years old."

"81-year-old stage (human)"

"Aged stage that refers to an adult who is over 81 and under 82 years old."

"82-year-old stage (human)"

"Aged stage that refers to an adult who is over 82 and under 83 years old."

"83-year-old stage (human)"

"Aged stage that refers to an adult who is over 83 and under 84 years old."

"84-year-old stage (human)"

"Aged stage that refers to an adult who is over 84 and under 85 years old."

"85-year-old stage (human)"

"Aged stage that refers to an adult who is over 85 and under 86 years old."

"86-year-old stage (human)"

"Aged stage that refers to an adult who is over 86 and under 87 years old."

"87-year-old stage (human)"

"Aged stage that refers to an adult who is over 87 and under 88 years old."

"88-year-old stage (human)"

"Aged stage that refers to an adult who is over 88 and under 89 years old."

"89-year-old stage (human)"

"Aged stage that refers to an adult who is over 89 and under 90 years old."

"90-year-old stage (human)"

"Aged stage that refers to an adult who is over 90 and under 91 years old."

"91-year-old stage (human)"

"Aged stage that refers to an adult who is over 91 and under 92 years old."

"92-year-old stage (human)"

"Aged stage that refers to an adult who is over 92 and under 93 years old."

"93-year-old stage (human)"

"Aged stage that refers to an adult who is over 93 and under 94 years old."

"94-year-old stage (human)"

"Aged stage that refers to an adult who is over 94 and under 95 years old."

"95-year-old stage (human)"

"Aged stage that refers to an adult who is over 95 and under 96 years old."

"96-year-old stage (human)"

"Aged stage that refers to an adult who is over 96 and under 97 years old."

"97-year-old stage (human)"

"Aged stage that refers to an adult who is over 97 and under 98 yers old."

"98-year-old stage (human)"

"Aged stage that refers to an adult who is over 98 and under 99."

"99-year-old stage (human)"

"Aged stage that refers to an adult who is over 99 and under 100 years old."

"100-year-old stage (human)"

"Aged stage that refers to an adult who is over 100 and under 101 years old."

"101-year-old stage (human)"

"Aged stage that refers to an adult who is over 101 and under 102 years old."

"102-year-old stage (human)"

"Aged stage that refers to an adult who is over 102 and under 103 years old."

"103-year-old stage (human)"

"Aged stage that refers to an adult who is over 103 and under 104 years old."

"104-year-old stage (human)"

"Aged stage that refers to an adult who is over 104 and under 105 years old."

"105-year-old stage (human)"

"Aged stage that refers to an adult who is over 105 and under 106 years old."

"106-year-old stage (human)"

"Aged stage that refers to an adult who is over 106 and under 107 years old."

"third decade stage (human)"

"Human stage that refers to an individual who is over 20 and under 30 years old."

"fourth decade stage (human)"

"Human stage that refers to an individual who is over 30 and under 40 years old."

"fifth decade stage (human)"

"Human stage that refers to an individual who is over 40 and under 50 years old."

"sixth decade stage (human)"

"Human stage that refers to an individual who is over 50 and under 60 years old."

"seventh decade stage (human)"

"Human stage that refers to an individual who is over 60 and under 70 years old."

"eighth decade stage (human)"

"Human stage that refers to an individual who is over 70 and under 80 years old."

"ninth decade stage (human)"

"Human stage that refers to an individual who is over 80 and under 90 years old."

"tenth decade stage (human)"

"Human stage that refers to an individual who is over 90 and under 100 years old."

"eleventh decade stage (human)"

"Human stage that refers to a human who is over 100 and under 110 years old."

"1-year-old stage (human)"

"Child stage that refers to a child who is over 12 and under 24 months old."

"centenarian stage (human)"

"Aged stage that refers to an adult who is over 100 years old."

"107-year-old stage (human)"

"Aged stage that refers to an adult who is over 107 and under 108 years old."

"108-year-old stage (human)"

"Aged stage that refers to an adult who is over 108 and under 109 years old."

"109-year-old stage (human)"

"Aged stage that refers to an adult who is over 109 and under 110 years old."

"110-year-old stage (human)"

"Aged stage that refers to an adult who is over 110 and under 111 years old."

"111-year-old stage (human)"

"Aged stage that refers to an adult who is over 111 and under 112 years old."

"112-year-old stage (human)"

"Aged stage that refers to an adult who is over 112 and under 113 years old."

"113-year-old stage (human)"

"Aged stage that refers to an adult who is over 113 and under 114 years old."

"114-year-old stage (human)"

"Aged stage that refers to an adult who is over 114 and under 115 years old."

"child stage (human)"

"Human stage that refers to a child who is over 12 months and under 5 years old."

"young adult stage (human)"

"A prime adult stage that refers to an adult who is under 40 years old."

"middle aged stage (human)"

"Late adulthood that refers to an adult who is over 40 and under 60 years old."

"15-19 year-old (human)"

"A young adult stage that refers to an adult who is over 15 and under 20 years old."

"2-4 year-old child stage (human)"

"Child stage that refers to a child who is over 2 and under 5 years old."

"60-79 year-old stage (human)"

"Late adult stage that refers to an adult who is under 80 years old."

"1-month-old stage (human)"

"Infant stage that refers to an infant who is over 28 days and under 2 months old."

"4-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 4 and under 5 months old."

"5-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 5 and under 6 months old."

"6-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 6 and under 7 months old."

"7-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 7 and under 8 months old."

"8-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 8 and under 9 months old."

"9-month-old stage (opossum)"

"Adulthood stage that refers to a opossum which is over 9 and under 10 months old."

"10-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 10 and under 11 months old."

"11-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 11 and under 12 months old."

"12-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 12 and under 13 months old."

"13-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 13 and under 14 months old."

"14-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 14 and under 15 months old."

"15-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 15 and under 16 months old."

"16-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 16 and under 17 months old."

"17-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 17 and under 18 months old."

"18-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 18 and under 19 months old."

"19-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 19 and under 20 months old."

"20-month-old stage (opossum)"

"Mature stage that refers to a opossum which is over 20 and under 21 months old."

"21-month-old stage (opossum)"

"Aged stage that refers to a opossum which is over 21 and under 22 months old."

"22-month-old stage (opossum)"

"Aged stage that refers to a opossum which is over 22 and under 23 months old."

"23-month-old stage (opossum)"

"Aged stage that refers to a opossum which is over 23 and under 24 months old."

"24-month-old stage (opossum)"

"Aged stage that refers to a opossum which is over 24 and under 25 months old."

"25-month-old stage (opossum)"

"Aged stage that refers to a opossum which is over 25 and under 26 months old."

"26-month-old and over stage (opossum)"

"Aged stage that refers to a opossum which is over 26 months old."

"2-week-old stage (opossum)"

"Infant stage that refers to an infant opossum which is over 2 and under 3 weeks old."

"3-week-old stage (opossum)"

"Infant stage that refers to an infant opossum which is over 3 and under 4 weeks old."

"4-week-old stage (opossum)"

"Infant stage that refers to an infant opossum which is over 4 and under 5 weeks old."

"5-week-old stage (opossum)"

"Infant stage that refers to an infant opossum which is over 5 and under 6 weeks old."

"6-week-old and over weaning stage (opossum)"

"Infant stage that refers to an infant opossum which is over 6 and under 7.5 weeks old, the time when usually opossum weaning occurs."

"14-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 14 and under 15 days old."

"15-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 15 and under 16 days old."

"16-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 16 and under 17 days old."

"17-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 17 and under 18 days old."

"18-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 18 and under 19 days old."

"19-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 19 and under 20 days old."

"20-day-old stage (opossum)"

"Infant stage that refers to a 2-week-old opossum which is over 20 and under 21 days old."

"1-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 1 and under 2 months old."

"2-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 2 and under 3 months old."

"3-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 3 and under 4 months old."

"4-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 4 and under 5 months old."

"5-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 5 and under 6 months old."

"6-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 6 and under 7 months old."

"7-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 7 and under 8 months old."

"8-month-old stage (macaque)"

"Nursing stage that refers to a rhesus who is over 8 and under 9 months old."

"9-month-old nursing stage (macaque)"

"Nursing stage that refers to a nursing rhesus who is over 9 and under 10 months old."

"9-month-old weaning stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 9 and under 10 months old."

"10-month-old stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 10 and under 11 months old."

"11-month-old stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 11 and under 12 months old."

"1-year-old stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 1 and under 2 years old."

"2-year-old stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 2 and under 3 years old."

"3-year-old immature stage (macaque)"

"Juvenile stage stage that refers to a rhesus who is over 3 and under 4 years old."

"3-year-old mature stage (macaque)"

"Adulthood stage stage that refers to a mature rhesus who is over 3 and under 4 years old."

"4-year-old stage (macaque)"

"Adulthood stage stage that refers to a mature rhesus who is over 4 and under 5 years old."

"5-year-old stage (macaque)"

"Adulthood stage stage that refers to a mature rhesus who is over 5 and under 6 years old."

"6-year-old stage (macaque)"

"Adulthood stage stage that refers to a mature rhesus who is over 6 and under 7 years old."

"7-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 7 and under 8 years old."

"8-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 8 and under 9 years old."

"9-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 9 and under 10 years old."

"10-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 10 and under 11 years old."

"11-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 11 and under 12 years old."

"12-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 12 and under 13 years old."

"13-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 13 and under 14 years old."

"14-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 14 and under 15 years old."

"15-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 15 and under 16 years old."

"16-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 16 and under 17 years old."

"17-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 17 and under 18 years old."

"18-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 18 and under 19 years old."

"19-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 19 and under 20 years old."

"20-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 20 and under 21 years old."

"21-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 21 and under 22 years old."

"22-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 22 and under 23 years old."

"23-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 23 and under 24 years old."

"24-year-old stage (macaque)"

"Adulthood stage stage that refers to a rhesus who is over 24 and under 25 years old."

"25-year-old stage (macaque)"

"Aged stage stage that refers to a rhesus who is over 25 and under 26 years old."

"26-year-old stage (macaque)"

"Aged stage stage that refers to a rhesus who is over 26 and under 27 years old."

"27-year-old stage (macaque)"

"Aged stage stage that refers to a rhesus who is over 27 and under 28 years old."

"28-year-old stage (macaque)"

"Aged stage stage that refers to a rhesus who is over 28 and under 29 years old."

"29 year-old and over stage (macaque)"

"Aged stage stage that refers to a rhesus who is over 29 years old."

"Theiler stage 02 (mouse)"

"Embryonic cleavage stage defined by a dividing 2-4 cells egg."

"Theiler stage 03 (mouse)"

"Embryonic cleavage stage defined by a dividing 4-16 cells egg, early to fully compacted morula."

"Theiler stage 04 (mouse)"

"Embryonic blastula stage defined by a dividing 16-40 cells egg, with early evidence of the blastocoelic cavity."

"Theiler stage 05 (mouse)"

"Embryonic blastula stage defined by a zona free blastocyst (zona pellucida absent)."

"Theiler stage 06 (mouse)"

"Embryonic blastula stage during which the blastocyst attaches, with first evidence of embryonic endoderm cells covering the blastocoelic surface of the inner cell mass."

"Theiler stage 07 (mouse)"

"Embryonic blastula stage defined by implantation and formation of the egg cylinder resulting from the rapid increase in the number of inner cell mass cells."

"Theiler stage 08 (mouse)"

"Embryonic blastula stage during which the egg cylinder differentiates into embryonic and extra-embryonic regions, and the pro-amniotic cavity appears."

"Theiler stage 09 (mouse)"

"Embryonic gastrula stage during which gastrulation starts with first evidence of mesoderm and visible embryonic axis."

"Theiler stage 10 (mouse)"

"Embryonic gastrula stage during which the primitive streak bulges into the pro-amniotic cavity and forms the amniotic fold; the exocoelom appears; the allantoic bud first appears, gastrulation continues and the node becomes visible."

"Theiler stage 12 (mouse)"

"Organogenesis stage during which first somites become visible."

"Theiler stage 13 (mouse)"

"Organogenesis stage defined by the turning of the embryo; initiated in embryos with 6-8 pairs of somites and usually completed in embryos with 14-16 pairs of somites."

"Theiler stage 14 (mouse)"

"Organogenesis stage during which the rostral extremity of the neural tube closes in embryos with usually about 15-18 somite pairs. Late in the stage the 3rd branchial arch becomes visible."

"Theiler stage 15 (mouse)"

"Organogenesis stage during which the posterior neuropore forms and the condensation of the forelimb bud becomes apparent near the 8th-12th somite pairs."

"Theiler stage 16 (mouse)"

"Organogenesis stage during which the posterior neuropore closes and the hind limb bud becomes visible at the level of the 23rd-28th somites."

"Theiler stage 17 (mouse)"

"Organogenesis stage defined by the deepening of the lens pit and the first appearance of the physiological umbilical hernia."

"Theiler stage 18 (mouse)"

"Organogenesis stage during which the lens vesicle gradually closes and the nasal pits start to form. The rapid growth of the brain is striking."

"Theiler stage 19 (mouse)"

"Organogenesis stage during which the lens vesicle becomes completely closed and detached from the ectoderm, and peripheral margins of the eye become well defined."

"Theiler stage 20 (mouse)"

"Organogenesis stage during which the handplate develops angles corresponding to the future digits, and tongue and brain vesicles are clearly visible."

"Theiler stage 21 (mouse)"

"Organogenesis stage during which the digit widths and locations can be discerned, and the pinna rapidly develops and forms a crest at right angles to the head."

"Theiler stage 22 (mouse)"

"Organogenesis stage during which the fingers are clearly visible and the long bones of the limbs are present."

"Theiler stage 23 (mouse)"

"Fetal stage during which the toes separate and hair follicles are present in the cephalic region but not at the periphery of the vibrissae."

"Theiler stage 24 (mouse)"

"Fetal stage during which the umbilical hernia disappears and there is a corresponding increase in the size of the peritoneal sac."

"Theiler stage 25 (mouse)"

"Fetal stage during which the thickened skin forms wrinkles and the subcutaneous veins are less visible."

"Theiler stage 26 (mouse)"

"Fetal stage defined by long whiskers and during which the eyes are barely visible through the closed eyelids."

"2-month-old stage (mouse)"

"Early adult stage that refers to a mouse which is over 2 and under 3 months old."

"3-month-old stage (mouse)"

"Early adult stage that refers to a mouse which is over 3 and under 4 months old."

"4-month-old stage (mouse)"

"Early adult stage that refers to a mouse which is over 4 and under 5 months old."

"5-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 5 and under 6 months old."

"6-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 6 and under 7 months old."

"7-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 7 and under 8 months old."

"8-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 8 and under 9 months old."

"9-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 9 and under 10 months old."

"10-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 10 and under 11 months old."

"11-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 11 and under 12 months old."

"12-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 12 and under 13 months old."

"13-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 13 and under 14 months old."

"14-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 14 and under 15 months old."

"15-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 15 and under 16 months old."

"16-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 16 and under 17 months old."

"17-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 17 and under 18 months old."

"18-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 18 and under 19 months old."

"19-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 19 and under 20 months old."

"20-month-old stage and over (mouse)"

"Mouse stage that refers to a mouse which is over 20 months old."

"Theiler stage 11b (mouse)"

"Embryonic neurula stage during which the neural plate formation occurs and the allantoic bud elongates ."

"Theiler stage 11c (mouse)"

"Embryonic neurula stage during which the neural plate formation occurs and the head folds are formed while the neural groove becomes visible."

"Theiler stage 11d (mouse)"

"Embryonic neurula stage during which the neural plate formation occurs and the head folds continue to enlarge while the foregut pocket begins to form."

"Theiler stage 09a (mouse)"

"Theiler developmental stage 9 defined by advanced endometrial reaction and during which the egg-cylinder stage advances with the first evidence of an embryonic axis."

"Theiler stage 09b (mouse)"

"Theiler developmental stage 9 defined by advanced endometrial reaction and during which the first mesodermal cells are produced by gastrulation late in this stage."

"Theiler stage 10a (mouse)"

"Theiler developmental stage 10 during which the tissue at the posterior end of the primitive streak bulges into the pro-amniotic cavity and forms the amniotic fold."

"Theiler stage 10b (mouse)"

"Theiler developmental stage 10 during which small cavities coalesce to form a single cavity in the mesoderm of the posterior amniotic fold, the exocoelom."

"Theiler stage 10c (mouse)"

"Theiler developmental stage 10 during which the allantoic bud first appears, gastrulation continues and the node becomes visible."

"Theiler stage 12a (mouse)"

"Theiler developmental stage 12 defined by unturned embryo with first appearance of somite pairs 1-4 and during which the allantois extends further into the exocoelom. Maxillary components of the 1st branchial arch become prominent. The preotic sulcus is visible in the 2-3 somite embryo. The cardiogenic plate begins to form and the foregut pocket is clearly visible."

"Theiler stage 12b (mouse)"

"Theiler developmental stage 12 defined by unturned embryo with first appearance of somite pairs 5-7 and during which neural closure occurs in the region of the 4th and 5th somites, extending in both directions from this site. Headfolds are particularly prominent. Optic placodes are first evident and become indented to form the optic pits. The heart rudiment develops rapidly. The allantois contacts the chorion at the end of this stage."

"Theiler stage 11a (mouse)"

"Embryonic neurula stage during which the neural plate formation occurs and the amniotic cavity is sealed off into three distinct cavities - the amniotic cavity, the exocoelom and the ectoplacental cleft."

"4-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 4 and under 5 days old."

"5-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 5 and under 6 days old."

"6-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 6 and under 7 days old."

"7-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 7 and under 8 days old."

"8-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 8 and under 9 days old."

"9-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 9 and under 10 days old."

"10-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 10 and under 11 days old."

"11-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 11 and under 12 days old."

"12-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 12 and under 13 days old."

"13-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 13 and under 14 days old."

"20-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 20 and under 21 months old."

"21-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 21 and under 22 months old."

"22-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 22 and under 23 months old."

"23-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 23 and under 24 months old."

"24-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 24 and under 25 months old."

"25-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 25 and under 26 months old."

"26-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 26 and under 27 months old."

"27-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 27 and under 28 months old."

"28-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 28 and under 29 months old."

"29-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 29 and under 30 months old."

"middle aged stage (mouse)"

"Prime adult stage that refers to a mouse which is over 10 and under 18 months old."

"3-6 month-old mature stage (mouse)"

"Mature stage that refers to a mouse which is over 3 and under 7 months old."

"4-6 days (mouse)"

"Immature stage that refers to the newborn mouse which is over 4 days and under 7 days old."

"1-week-old stage (mouse)"

"Immature stage that refers to a mouse which is over 7 days and under 14 days old."

"2-week-old stage (mouse)"

"Immature stage that refers to a mouse which is over 14 days and under 21 days old."

"21-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 21 and under 22 days old."

"22-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 22 and under 23 days old."

"23-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 23 and under 24 days old."

"24-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 24 and under 25 days old."

"25-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 25 and under 26 days old."

"26-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 26 and under 27 days old."

"27-day-old stage (mouse)"

"Immature stage that refers to a mouse which is over 27 and under 28 days old."

"4-week-old stage (mouse)"

"Immature stage that refers to a mouse which is over 28 days and under 35 days old."

"5-week-old stage (mouse)"

"Immature stage that refers to a mouse which is over 35 days and under 42 days old."

"6-week-old stage (mouse)"

"Prime adult stage that refers to a mouse which is over 42 days and under 49 days old."

"7-week-old stage (mouse)"

"Prime adult stage that refers to a mouse which is over 49 days and under 56 days old."

"young adult stage (mouse)"

"Prime adult stage that refers to a sexually mature mouse under 10 months old."

"8-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 56 days and under 63 days old."

"9-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 63 days and under 70 days old."

"10-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 70 days and under 77 days old."

"11-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 77 days and under 84 days old."

"12-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 84 days and under 91 days old."

"13-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 91 days and under 98 days old."

"14-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 98 days and under 105 days old."

"15-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 105 days and under 112 days old."

"16-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 112 days and under 119 days old."

"17-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 119 days and under 126 days old."

"18-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 126 days and under 133 days old."

"19-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 133 days and under 140 days old."

"20-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 140 days and under 147 days old."

"21-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 147 days and under 154 days old."

"22-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 154 days and under 161 days old."

"23-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 161 days and under 168 days old."

"24-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 168 days and under 175 days old."

"25-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 175 days and under 182 days old."

"26-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 182 days and under 189 days old."

"27-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 189 days and under 196 days old."

"28-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 196 days and under 203 days old."

"29-week-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 203 days and under 210 days old."

"30-month-old stage (mouse)"

"Mouse stage that refers to a mouse which is over 30 and under 31 months old."

"day 1-3 cleavage stage (sheep)"

"Cleavage stage during which the sheep embryo undergoes the first 3 days of development."

"day 4-5 morula stage (sheep)"

"Cleavage stage during which the sheep embryo (16-32 cells egg) undergoes the fourth and fith days of development."

"day 6-9 embryonic stage (sheep)"

"Embryonic stage during which the sheep embryo develops into a spherical blastocyst and performs zona hatching."

"day 10 embryonic stage (sheep)"

"Embryonic stage during which the sheep embryo measures 400–900 micron in diameter and contains approximately 3000 cells."

"day 11 embryonic stage (sheep)"

"Embryonic stage during which the sheep embryo starts to elongate into tubular blastocyst."

"day 12 embryonic stage (sheep)"

"Embryonic stage during which the sheep embryo has elongated markedly, reaching a length of 10–22 mm."

"day 13 embryonic stage (sheep)"

"Embryonic stage during which the conceptus, first located in the uterine horn ipsilateral to the corpus luteum, elongates into the contralateral horn."

"day 14 embryonic stage (sheep)"

"Embryonic stage during which the filamentous conceptus is about 10 cm long and the primitive streak appears, with somites soon thereafter."

"day 15 embryonic stage (sheep)"

"Embryonic stage during which the apposition stage starts, with first intimate cellular contacts between the trophoblast and the uterine epithelium."

"day 16 embryonic stage (sheep)"

"Embryonic stage during which the trophoblast begins to adhere firmly to the endometrial lumenal epithelium."

"day 17-19 embryonic stage (sheep)"

"Embryonic stage during which the tubular blastocyst reaches a length of 25 cm or more by day 17 and resembles a long filament composed mainly of extraembryonic trophoblast."

"day 20 embryonic stage (sheep)"

"Embryonic stage during which the embryo undergoes the twentieth day of development, while adhesion is fully completed."

"21-month-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 21 and under 22 months old."

"22-month-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 22 and under 23 months old."

"23-month-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 23 and under 24 months old."

"2-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 24 months and under 3 years old."

"3-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 3 and under 4 years old."

"4-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 4 and under 5 years old."

"5-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 5 and under 6 years old."

"6-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 6 and under 7 years old."

"7-year-old stage (bonobo)"

"Juvenile stage that refers to a bonobo who is over 7 and under 8 years old."

"8-year-old immature stage (bonobo)"

"Juvenile stage that refers to a immature bonobo who is over 8 and under 9 years old."

"8-year-old mature stage (bonobo)"

"Adulthood stage that refers to a mature bonobo who is over 8 and under 9 years old."

"9-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 9 and under 10 years old."

"10-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 10 and under 11 years old."

"11-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 11 and under 12 years old."

"12-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 12 and under 13 years old."

"13-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 13 and under 14 years old."

"14-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 14 and under 15 years old."

"15-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 15 and under 16 years old."

"16-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 16 and under 17 years old."

"17-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 17 and under 18 years old."

"18-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 18 and under 19 years old."

"19-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 19 and under 20 years old."

"20-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 20 and under 21 years old."

"21-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 21 and under 22 years old."

"22-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 22 and under 23 years old."

"23-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 23 and under 24 years old."

"24-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 24 and under 25 years old."

"25-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 25 and under 26 years old."

"26-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 26 and under 27 years old."

"27-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 27 and under 28 years old."

"28-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 28 and under 29 years old."

"29-year-old stage (bonobo)"

"Adulthood stage that refers to a bonobo who is over 29 and under 30 years old."

"3-year-old stage (chimpanzee)"

"Juvenile stage that refers to a chimpanzee who is under 4 years old."

"4-year-old stage (chimpanzee)"

"Juvenile stage that refers to a chimpanzee who is over 4 and under 5 years old."

"5-year-old stage (chimpanzee)"

"Juvenile stage that refers to a chimpanzee who is over 5 and under 6 years old."

"6-year-old stage (chimpanzee)"

"Juvenile stage that refers to a chimpanzee who is over 6 and under 7 years old."

"7-year-old stage (chimpanzee)"

"Juvenile stage that refers to a chimpanzee who is over 7 and under 8 years old."

"8-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 8 and under 9 years old."

"9-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 9 and under 10 years old."

"10-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 10 and under 11 years old."

"11-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 11 and under 12 years old."

"12-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 12 and under 13 years old."

"13-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 13 and under 14 years old."

"14-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 14 and under 15 years old."

"15-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 15 and under 16 years old."

"16-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 16 and under 17 years old."

"17-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 17 and under 18 years old."

"18-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 18 and under 19 years old."

"19-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 18 and under 19 years old."

"20-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 20 and under 21 years old."

"21-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 21 and under 22 years old."

"22-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 22 and under 23 years old."

"23-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 23 and under 24 years old."

"24-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 24 and under 25 years old."

"25-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 25 and under 26 years old."

"26-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 26 and under 27 years old."

"27-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 27 and under 28 years old."

"28-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 28 and under 29 years old."

"29-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 29 and under 30 years old."

"30-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 30 and under 31 years old."

"31-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 31 and under 32 years old."

"32-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 32 and under 33 years old."

"33-year-old stage (chimpanzee)"

"Adulthood stage that refers to a chimpanzee who is over 33 and under 34 years old."

"34-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 34 under 35 years old."

"35-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 35 and under 36 years old."

"36-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 36 and under 37 years old."

"37-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 37 and under 38 years old."

"38-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 38 and under 39 years old."

"39-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 39 and under 40 years old."

"40-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 40 and under 41 years old."

"41-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 41 and under 42 years old."

"42-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 42 and under 43 years old."

"43-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 43 and under 44 years old."

"44-year-old stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 44 and under 45 years old."

"45-year-old and over stage (chimpanzee)"

"Aged stage that refers to a chimpanzee who is over 45 years old."

"primitive streak stage (rat)"

"Embryonic stage during which the primitive streak appears."

"tail bud embryo stage (rat)"

"Embryonic stage during which somites 26-28(upper lumbar) up to somites 39-40(caudal) appear."

"complete embryo stage (rat)"

"Embryonic stage during which somites 41-42(caudal) appear and tail and allantoic stalk rise to the placenta."

"metamorphosing embryo stage (rat)"

"Embryonic stage during which somites 43-45 (caudal) up to somite 65 (usually this is last caudal) appear."

"10-week-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 10 and under 11 weeks old."

"11-week-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 11 and under 12 weeks old."

"3-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 3 and under 4 months old."

"4-6-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 4 and under 7 months old."

"4-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 4 and under 5 months old."

"5-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 5 and under 6 months old."

"6-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 6 and under 7 months old."

"7-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 7 and under 8 months old."

"8-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 8 and under 9 months old."

"9-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 9 and under 10 months old."

"10-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 10 and under 11 months old."

"11-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 11 and under 12 months old."

"12-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 12 and under 13 months old."

"13-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 13 and under 14 months old."

"14-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 14 and under 15 months old."

"15-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 15 and under 16 months old."

"16-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 16 and under 17 months old."

"17-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 17 and under 18 months old."

"18-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 18 and under 19 months old."

"19-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 19 and under 20 months old."

"20-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 20 and under 21 months old."

"21-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 21 and under 22 months old."

"22-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 22 and under 23 months old."

"23-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 23 and under 24 months old."

"24-26-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 24 and under 27 months old."

"24-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 24 and under 25 months old."

"25-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 25 and under 26 months old."

"26-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 26 and under 27 months old."

"27-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 27 and under 28 months old."

"28-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 28 and under 29 months old."

"29-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 29 and under 30 months old."

"30-month-old stage (rat)"

"Rat developmental stage that refers to a sexually mature adult rat, which is over 30 and under 31 months old."

"Witschi stage 2 (rat)"

"Cleavage stage defined by 2-cells embryo (in oviduct)"

"Witschi stage 3 (rat)"

"Cleavage stage defined by 4-cells embryo (in oviduct)"

"Witschi stage 4 (rat)"

"Cleavage stage defined by an embryo of 8-12 cells (in oviduct)"

"Witschi stage 5 (rat)"

"Cleavage stage defined by the morula (in oviduct)"

"day 0 of fry stage (salmon)"

"The day of the alevin leaving its yolk sac and beginning to be a fry."

"day 1 of fry stage (salmon)"

"First day of the life of the Salmon salar living as a fry and actively feeding."

"1-week-old stage (pig)"

"Immature stage that refers to a pig which is over 1 and under 2 weeks old."

"2-week-old stage (pig)"

"Immature stage that refers to a pig which is over 2 and under 3 weeks old."

"3-week-old stage (pig)"

"Immature stage that refers to a pig which is over 3 and under 4 weeks old."

"4-week-old stage (pig)"

"Immature stage that refers to a pig which is over 4 and under 5 weeks old."

"5-week-old stage (pig)"

"Immature stage that refers to a pig which is over 5 and under 6 weeks old."

"6-week-old stage (pig)"

"Immature stage that refers to a pig which is over 6 and under 7 weeks old."

"7-week-old stage (pig)"

"Immature stage that refers to a pig which is over 7 and under 8 weeks old."

"8-week-old stage (pig)"

"2 month-old stage that refers to a mouse which is over 56 days and under 64 days old."

"21-day-old stage (pig)"

"Immature stage that refers to a pig which is over 21 and under 22 days old."

"22-day-old stage (pig)"

"Immature stage that refers to a pig which is over 22 and under 23 days old."

"23-day-old stage (pig)"

"Immature stage that refers to a pig which is over 23 and under 24 days old."

"24-day-old stage (pig)"

"Immature stage that refers to a pig which is over 24 and under 25 days old."

"25-day-old stage (pig)"

"Immature stage that refers to a pig which is over 25 and under 26 days old."

"26-day-old stage (pig)"

"Immature stage that refers to a pig which is over 26 and under 27 days old."

"27-day-old stage (pig)"

"Immature stage that refers to a pig which is over 27 and under 28 days old."

"28-day-old stage (pig)"

"Immature stage that refers to a pig which is over 28 and under 29 days old."

"29-day-old stage (pig)"

"Immature stage that refers to a pig which is over 29 and under 30 days old."

"30-day-old stage (pig)"

"Immature stage that refers to a pig which is over 30 and under 31 days old."

"31-day-old stage (pig)"

"Immature stage that refers to a pig which is over 31 and under 32 days old."

"32-day-old stage (pig)"

"Immature stage that refers to a pig which is over 32 and under 33 days old."

"33-day-old stage (pig)"

"Immature stage that refers to a pig which is over 33 and under 34 days old."

"34-day-old stage (pig)"

"Immature stage that refers to a pig which is over 34 and under 35 days old."

"35-day-old stage (pig)"

"Immature stage that refers to a pig which is over 35 and under 36 days old."

"36-day-old stage (pig)"

"Immature stage that refers to a pig which is over 36 and under 37 days old."

"37-day-old stage (pig)"

"Immature stage that refers to a pig which is over 37 and under 38 days old."

"38-day-old stage (pig)"

"Immature stage that refers to a pig which is over 38 and under 39 days old."

"39-day-old stage (pig)"

"Immature stage that refers to a pig which is over 39 and under 40 days old."

"40-day-old stage (pig)"

"Immature stage that refers to a pig which is over 40 and under 41 days old."

"41-day-old stage (pig)"

"Immature stage that refers to a pig which is over 41 and under 42 days old."

"2-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 2 and under 3 months old."

"9-week-old stage (pig)"

"2 month-old stage that refers to a mouse which is over 63 days and under 71 days old."

"10-week-old stage (pig)"

"2 month-old stage that refers to a mouse which is over 70 days and under 78 days old."

"11-week-old stage (pig)"

"2 month-old stage that refers to a mouse which is over 77 days and under 85 days old."

"3-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 3 and under 4 months old."

"12-week-old stage (pig)"

"3 month-old stage that refers to a mouse which is over 84 days and under 92 days old."

"13-week-old stage (pig)"

"3 month-old stage that refers to a mouse which is over 91 days and under 99 days old."

"14-week-old stage (pig)"

"3 month-old stage that refers to a mouse which is over 98 days and under 106 days old."

"15-week-old stage (pig)"

"3 month-old stage that refers to a mouse which is over 105 days and under 113 days old."

"4-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 4 and under 5 months old."

"16-week-old stage (pig)"

"4 month-old stage that refers to a mouse which is over 112 days and under 120 days old."

"17-week-old stage (pig)"

"4 month-old stage that refers to a mouse which is over 119 days and under 127 days old."

"18-week-old stage (pig)"

"4 month-old stage that refers to a mouse which is over 126 days and under 134 days old."

"19-week-old stage (pig)"

"4 month-old stage that refers to a mouse which is over 133 days and under 141 days old."

"20-week-old stage (pig)"

"4 month-old stage that refers to a mouse which is over 140 days and under 148 days old."

"5-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 5 and under 6 months old."

"21-week-old stage (pig)"

"5 month-old stage that refers to a mouse which is over 147 days and under 155 days old."

"22-week-old stage (pig)"

"5 month-old stage that refers to a mouse which is over 154 days and under 162 days old."

"23-week-old stage (pig)"

"5 month-old stage that refers to a mouse which is over 161 days and under 169 days old."

"24-week-old stage (pig)"

"5 month-old stage that refers to a mouse which is over 168 days and under 176 days old."

"6-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 6 and under 7 months old."

"7-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 7 and under 8 months old."

"8-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 8 and under 9 months old."

"9-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 9 and under 10 months old."

"10-month-old stage (pig)"

"Juvenile stage that refers to a pig which is over 10 and under 11 months old."

"11-month-old stage (pig)"

"Mature stage that refers to a pig which is over 11 and under 12 months old."

"1-year-old stage (pig)"

"Mature stage that refers to a pig which is over 1 and under 2 years old."

"2-year-old stage (pig)"

"Mature stage that refers to a pig which is over 2 and under 3 years old."

"3-year-old stage (pig)"

"Mature stage that refers to a pig which is over 3 and under 4 years old."

"4-year-old stage (pig)"

"Mature stage that refers to a pig which is over 4 and under 5 years old."

"5-year-old stage (pig)"

"Mature stage that refers to a pig which is over 5 and under 6 years old."

"6-year-old stage (pig)"

"Mature stage that refers to a pig which is over 6 and under 7 years old."

"7-year-old stage (pig)"

"Mature stage that refers to a pig which is over 7 and under 8 years old."

"0-day-old stage (pig)"

"Postnatal stage that refers to a new born pig which is under 24 hours old."

"1-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 1 and under 2 days old."

"2-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 2 and under 3 days old."

"3-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 3 and under 4 days old."

"4-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 4 and under 5 days old."

"5-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 5 and under 6 days old."

"6-day-old stage (pig)"

"Postnatal stage that refers to a pig which is over 6 and under 7 days old."

"ridge limb stage (pig)"

"Pig fetal stage when the developing limb begins to grow out from the flank."

"bud limb stage (pig)"

"Pig fetal stage when the developing limb looks like a semicircle that is as long as it is wide."

"paddle limb stage (pig)"

"Pig fetal stage when the developing limb looks like a hand-plate."

"fully formed stage"

"The stage of development at which the animal is fully formed, including immaturity and maturity. Includes both sexually immature stage, and adult stage."

"embryo stage"

"A life cycle stage that starts with fertilization and ends with the fully formed embryo."

"larval stage"

"A distinct juvenile stage many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle."

"pupal stage"

"A life cycle stage of holometabolous insects in which the organism is a pupa and starts with the larval-pupal apolysis and ends with pupal-adult apolysis."

"post-embryonic stage"

"stage succeeding embryo, including mature structure"

"life cycle"

"An entire span of an organism's life, commencing with the zygote stage and ending in the death of the organism."

"zygote stage"

"A stage at which the organism is a single cell produced by means of sexual reproduction."

"cleavage stage"

"The first few specialized divisions of an activated animal egg; Stage consisting of division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called the morula. Cleavage ends with the formation of the blastula."

"blastula stage"

"An early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence."

"gastrula stage"

"A stage defined by complex and coordinated series of cellular movements that occurs at the end of cleavage during embryonic development of most animals. The details of gastrulation vary from species to species, but usually result in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm."

"neurula stage"

"Staged defined by the formation of a tube from the flat layer of ectodermal cells known as the neural plate. This will give rise to the central nervous system."

"organogenesis stage"

"A stage at which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism."

"post-juvenile"

"The stage of being a sexually mature adult animal."

"pharyngula stage"

"A stage that follows the blastula, gastrula and neurula stages. At the pharyngula stage, all vertebrate embryos show remarkable similarities."

"amphibian larval stage"

"Amphibian larvae, sometimes called pollywogs or tadpoles, hatch from eggs and begin to grow limbs and other adult physical features at various times, depending on the species, before they metamorphose into the adult form."

"nematode larval stage"

"Nematode larval development begins with the newly hatched first-stage larva (L1) and ends with the end of the last larval stage (for example the fourth larval stage (L4) in C. elegans). Each stage of nematode larval development is characterized by proliferation of specific cell lineages and an increase in body size without alteration of the basic body plan. Nematode larval stages are separated by molts in which each stage-specific exoskeleton, or cuticle, is shed and replaced anew."

"instar larval stage"

"This begins with the newly hatched first-instar larva, through its maturation to the end of the last larval stage. An example of this process is found in Drosophila melanogaster."

"late embryonic stage"

"An embryo stage that covers late steps of the embryogenesis with a fully formed embryo still developing before birth or egg hatching."

"neonate stage"

"Of or pertaining to the period of time immediately following birth, or to the newborn."

"tadpole stage"

"wholly aquatic larval stage in the life cycle of an amphibian, particularly of a frog or toad[WP]. XAO: The stages from feeding to the end of metamorphosis. Encompasses Weisz's first-form tadpole (equivalent to NF stages 45 to 49), second-form tadpole (NF 49 to 56) and third-form tadpole (NF 56 to 60-plus) stages."

"prime adult stage"

"A life cycle stage that starts at completion of development and growth of the sexually mature adult animal, and ends before senescence."

"nursing stage"

"A mammalian developmental stage that covers the period from birth until weaning."

"juvenile stage"

"The stage of being no more dependent of the nest and/or from caregivers for subsistence while having not reach sexual maturity."

"infant stage"

"Nursing stage that follows the neonate stage in mammals and ends at weaning."

"start of neonate stage"

"A life cycle temporal boundary that marks the start of the neonate stage of the organism."

"28-cell embryo Ce (C. elegans)"

"The C. elegans life stage spanning 100-105 min after first cleaveage at 20 Centigrade. Contains 28 cells."

"51-cell embryo Ce (C. elegans)"

"The C. elegans life stage spanning 120-135 min after first cleavage at 20 Centigrade. Contains 51 cells."

"88-cell embryo Ce (C. elegans)"

"The C. elegans life stage spanning 145-150 min after first cleavage at 20 Centigrade. Contains 88 cells."

"enclosing embryo Ce (C. elegans)"

"The C. elegans life stage spanning 290-350min after first cleavage at 20 Centigrade. Proliferate from 421 cells to 560 cells. The stage when embryo just finished gastrulation and is enclosing."

"late cleavage stage embryo Ce (C. elegans)"

"The C. elegans life stage spanning 210-350min after first cleavage at 20 Centigrade. Proliferate from 421 cells to 560 cells. The stage before the fast cleavage of cells finishes."

"elongating embryo Ce (C. elegans)"

"The C. elegans life stage spanning 350-620min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The stage that embryo starts elongation until elongation is over."

"bean embryo Ce (C. elegans)"

"The C. elegans life stage spanning 350-390min after first cleavage at 20 Centigrade.  Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. Emrbyo elongation started but have not formed comma shape yet. The shape of embryo looks like a lima bean. A stage right before comma embryo. Also called lima embryo or lima bean stage."

"comma embryo Ce (C. elegans)"

"The C. elegans life stage spanning 390-420min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo looks like a comma. A stage between bean embryo and 1.5-fold embryo."

"1.5-fold embryo Ce (C. elegans)"

"The C. elegans life stage spanning 420-460min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and fold back 50%. A stage between comma embryo and 2-fold embryo."

"2-fold embryo Ce (C. elegans)"

"The C. elegans life stage spanning 460-520min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and double fold. A stage between 1.5-fold embryo and 3-fold embryo."

"3-fold embryo Ce (C. elegans)"

"The C. elegans life stage spanning 520-620min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and tripple fold. A stage between 2-fold embryo and fully-elongated embryo. Also called pretzel embryo or pretzel stage."

"fully-elongated embryo Ce (C. elegans)"

"The C. elegans life stage spanning 620-800min(hatch) after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. A stage after elongation is over. The last stage of embryogenesis. Also called pre-hatched embryo, late embryo or morphogenetic embryo."

"L1 larva Ce (C. elegans)"

"The first stage larva. At 25 Centigrade, it ranges 14-25.5 hours after fertilization, 0-11.5 hours after hatch."

"L1-L2 lethargus Ce (C. elegans)"

"The stage during L1-L2 molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L1-L2 molt Ce (C. elegans)"

"The stage when an animal shifts from L1 larva to L2 larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L2 larva Ce (C. elegans)"

"The second stage larva. At 25 Centigrade, it ranges 25.5-32.5 hours after fertilization, 11.5-18.5 hours after hatch."

"L2-L3 lethargus Ce (C. elegans)"

"The stage during L2-L3 molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L2-L3 molt Ce (C. elegans)"

"The stage when an animal shifts from L2 larva to L3 larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L2d-dauer lethargus Ce (C. elegans)"

"The stage during L2d-dauer molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L2d-dauer molt Ce (C. elegans)"

"The stage when an animal shifts from L2d larva to dauer larva. It includes the synthesis of new cuticle, cease of pharyngeal pumping during a lethargus stage, and the shed off of old cuticle."

"dauer larva Ce (C. elegans)"

"A third stage larva specialized for dispersal and long term survival."

"postdauer-L4 lethargus Ce (C. elegans)"

"The stage during postdauer-L4 molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"postdauer-L4 molt Ce (C. elegans)"

"The stage when an animal shifts from post dauer stage to L4 larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L3 larva Ce (C. elegans)"

"The third stage larva. At 25 Centigrade, it ranges 32.5-40 hours after fertilization, 18.5-26 hours after hatch."

"L3-L4 lethargus Ce (C. elegans)"

"The stage during L3-L4 molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L3-L4 molt Ce (C. elegans)"

"The stage when an animal shifts from L3 larva to L4 larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L4 larva Ce (C. elegans)"

"The fourth stage larva. At 25 Centigrade, it ranges 40-49.5 hours after fertilization, 26-35.5 hours after hatch."

"L4-adult lethargus Ce (C. elegans)"

"The stage during L4-adult molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L4-adult molt Ce (C. elegans)"

"The stage when an animal shifts from L4 larva to adult. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L1-L2 ecdysis Ce (C. elegans)"

"The stage during L1-L2 molt, after the brief lethargus period, when an animal sheds off old cuticle."

"L1-L2d molt Ce (C. elegans)"

"The stage when an animal shifts from L1 larva to L2d larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L1-L2d lethargus Ce (C. elegans)"

"The stage during L1-L2d molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L1-L2d ecdysis Ce (C. elegans)"

"The stage during L1-L2d molt, after the brief lethargus period, when an animal sheds off old cuticle."

"L2d larva Ce (C. elegans)"

"A special second stage larva with altered physiology and developmental potential that leads to formation of dauer larva. At 25 Centigrade, it ranges 25.5-32.5 hours after fertilization, 11.5-18.5 hours after hatch."

"L2-L3 ecdysis Ce (C. elegans)"

"The stage during L2-L3 molt, after the brief lethargus period, when an animal sheds off old cuticle."

"L2d-dauer ecdysis Ce (C. elegans)"

"The stage during L2d-dauer molt, after the brief lethargus period, when an animal sheds off old cuticle."

"L3-L4 ecdysis Ce (C. elegans)"

"The stage during L3-L4 molt, after the brief lethargus period, when an animal sheds off old cuticle."

"L4-adult ecdysis Ce (C. elegans)"

"The stage during L4-adult molt, after the brief lethargus period, when an animal shed off old cuticle."

"postdauer-L4 ecdysis Ce (C. elegans)"

"The stage during postdauer-L4 molt, after the brief lethargus period, when an animal sheds off old cuticle."

"post dauer L3 stage Ce (C. elegans)"

"The stage right after an animal recovered from dauer but has not started transformation to L4 larva yet."

"L2d-L3 molt Ce (C. elegans)"

"The stage when an animal shifts from L2d larva to L3 larva. It includes the synthesis of new cuticle, cease of phrayngeal pumping during a lethargus stage, and the shed off of old cuticle."

"L2d-L3 lethargus Ce (C. elegans)"

"The stage during L2d-L3 molt when an animal becomes lethargic, ceases pharyngeal pumping and synthesizes new cuticle under the old."

"L2d-L3 ecdysis Ce (C. elegans)"

"The stage during L2d-L3 molt, after the brief lethargus period, when an animal sheds off old cuticle."

"reproductive stage adult hermaphrodite Ce (C. elegans)"

"Adult hermaphrodites continuously laying fertilized eggs. Hermaphrodite in egg laying stages--usually up to 4/5 days after L4-adult molt at Centigrade. From the first fertilized egg is laid, till all sperms are used. At 20 Centigrade: 13 hours after L4-adult molt until about 5.4 days after the L4-adult molt. 3-8.4 days after first cleavage."

"oocyte-laying stage adult hermaphrodite Ce (C. elegans)"

"When egg-laying is still going on but intermittent and during which a significant number of oocytes are laid. Included in reproductive stage adult hermaphrodite."

"post-reproductive stage adult hermaphrodite Ce (C. elegans)"

"Adult hermaphrodites that contain no more sperm, thus stop egg-laying, but still alive. At 20 Centigrade: 5.4 days after L4-adult molt until the death. 8.4 - 13.2 (average wild type life span) days after first cleavage."

"newly molted young adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 0-24 hours after L4-adult molt."

"1-day post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 24-48 hours after L4-adult molt. 4-5 days after first cleavage."

"2-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 48-72 hours after L4-adult molt. 5-6 days after first cleavage."

"3-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 72-96 hours after L4-adult molt. 6-7 days after first cleavage."

"4-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 96-120 hours after L4-adult molt. 7-8 days after first cleavage."

"5-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 5-6 days after L4-adult molt. 8-9 days after first cleavage."

"4-7 days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 4-7 days after L4-adult molt. 7-10 days after first cleavage."

"7-10 days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 7-10 days after L4-adult molt. 10-13 days after first cleavage."

"12-cell embryo Ce (C. elegans)"

"The C. elegans life stage spanning ~55 min after first cleavage at 20 Centigrade.  Contains 12 cells."

"11-15 days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 11-15 days after L4-adult molt. 14-18 days after first cleavage."

"14-cell embryo Ce (C. elegans)"

"E-cell has divided into Ea and Ep. Contains 14 cells."

"24-cell embryo Ce (C. elegans)"

"Fourth cleavage of the AB lineage. Contains 24 cells."

"44-cell embryo Ce (C. elegans)"

"Fifth cleavage of the AB lineage. Contains 44 cells."

"68-cell embryo Ce (C. elegans)"

"Sixth cleavage of the AB lineage. Contains 68 cells."

"86-cell embryo Ce (C. elegans)"

"Seventh cleavage of the AB lineage. Contains 86 cells."

"190-cells embryo Ce (C. elegans)"

"P4 and M cells have finished migrating. Contains 190 cells."

"96-cell embryo Ce (C. elegans)"

"The C. elegans life stage spanning 155-165 min after first cleavage at 20 Centigrade. Contains 96 cells."

"sheathed microfilaria (C. elegans)"

"A microfilaria life stage in which larvae are surrounded by a membrane thought to be derived from the vitelline membrane, hence "sheathed"."

"16-18 days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 16-18 days after L4-adult molt. 18-21 days after first cleavage."

"microfilaria (C. elegans)"

"An early stage in the life cycle of some parasitic nematodes which develops from the egg and precedes the L1 stage."

"unsheathed microfilaria (C. elegans)"

"A microfilaria life stage in which larvae are not sheathed by a membrane thought to be derived from the vitelline membrane."

"nodular microfilaria (C. elegans)"

"Microfilaria larvae found in nodules and ulcers."

"skin microfilaria (C. elegans)"

"Microfilaria larvae found subcutaneously"

"unfertilized egg Ce (C. elegans)"

"A developmental life stage of the nematode Caenorhabditis elegans that occurs in an egg (oocyte), before fertilization by sperm."

"6-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 6-7 days after L4-adult molt. 9-10 days after first cleavage."

"7-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 7-8 days after L4-adult molt. 10-11 days after first cleavage."

"8-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 8-9 days after L4-adult molt. 11-12 days after first cleavage."

"9-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 9-10 days after L4-adult molt. 12-13 days after first cleavage."

"10-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 10-11 days after L4-adult molt. 13-14 days after first cleavage."

"15-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 15-16 days after L4-adult molt. 18-19 days after first cleavage."

"20-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 20-21 days after L4-adult molt. 23-24 days after first cleavage."

"nematode infective stage larva (C. elegans)"

"Larval stage that is capable of infecting a host organism."

"L4.0 larva Ce (C. elegans)"

"The first sub-stage of the L4 larva. All vulval cells are migrating toward the center of the future vulva. vulA, vulB, and vulE have divided, but vulC and vulF have not. At 20 Centigrade: 34.3 hours after hatching, 0.3 hours from the L3-to-L4 molt."

"L4.1 larva Ce (C. elegans)"

"The second sub-stage of the L4 larva. The inner cells of the vulva have finished migrating and have formed toroids, but have not fused. vulC and vulF have divided and a narrow lumen has formed. At 20 Centigrade: 35.1 hours after hatching, 1.1 hours from the L3-to-L4 molt."

"L4.2 larva Ce (C. elegans)"

"The third sub-stage of the L4 larva. All vulval cells complete migration. vulA, vulC, and vulD undergo cell fusion. The vulval lumen has widened and a prominent kink has formed between vulC and vulD. The uterine lumen has not started to form. At 20 Centigrade: 36.8 hours after hatching, 2.8 hours from the L3-to-L4 molt."

"L4.3 larva Ce (C. elegans)"

"The fourth sub-stage of the L4 larva. vulFs have separated and the apex of the lumen is flat and capped by the anchor cell. The uterine lumen starts to form. At 20 Centigrade: 38.1 hours after hatching, 4.1 hours from the L3-to-L4 molt."

"L4.4 larva Ce (C. elegans)"

"The fifth sub-stage of the L4 larva. utse is visible as a thin layer separating the vulval and uterine lumens. 'Fingers' are formed at the sides of the vulva next to vulB1 and vulB2. The uterine lumen is fully distended. At 20 Centigrade: 39.0 hours after hatching, 5.0 hours from the L3-to-L4 molt."

"L4.5 larva Ce (C. elegans)"

"The sixth sub-stage of the L4 larva. The side of the vulval lumen between vulC and vulD forms a smooth curve. At 20 Centigrade: 40.4 hours after hatching, 6.4 hours from the L3-to-L4 molt."

"L4.6 larva Ce (C. elegans)"

"The seventh sub-stage of the L4 larva. 'Fingers' between vulB2 and vulC are pointed ventrally. At 20 Centigrade: 41.5 hours after hatching, 7.5 hours from the L3-to-L4 molt."

"L4.7 larva Ce (C. elegans)"

"The eighth sub-stage of the L4 larva. vulFs have migrated closer such that the lumen is narrowed in the dorsal section. The approximate cutoff is when the width of the channel is less than the width of the vulD nucleus. At 20 Centigrade: 42.3 hours after hatching, 8.3 hours from the L3-to-L4 molt."

"L4.8 larva Ce (C. elegans)"

"The ninth sub-stage of the L4 larva. The vulval lumen is partially collapsed. At 20 Centigrade: 42.5 hours after hatching, 8.5 hours from the L3-to-L4 molt."

"L4.9 larva Ce (C. elegans)"

"The tenth sub-stage of the L4 larva. The vulval lumen is completely collapsed. At 20 Centigrade: 42.8 hours after hatching, 8.8 hours from the L3-to-L4 molt."

"11-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 11-12 days after L4-adult molt. 14-15 days after first cleavage."

"12-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 12-13 days after L4-adult molt. 15-16 days after first cleavage."

"13-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 13-14 days after L4-adult molt. 16-17 days after first cleavage."

"14-days post-L4 adult hermaphrodite Ce (C. elegans)"

"At 20 Centigrade: 14-15 days after L4-adult molt. 17-18 days after first cleavage."

"newly hatched L1 larval stage Ce (C. elegans)"

"The stage that begins right after hatching and before development proceeds after feeding. A newly hatched L1 larva contains 558 cells."

"L1 arrest Ce (C. elegans)"

"The stage in which first stage larvae (L1) that hatch in the absence of food enter a state of developmental arrest."

"post dauer L4 stage Ce (C. elegans)"

"A C. elegans L4 larval life stage that occurs after the animal has recovered from the dauer diapause."

"post dauer adult stage Ce (C. elegans)"

"A C. elegans adult life stage that occurs after the animal has recovered from the dauer diapause."

"early tailbud stage (Xenopus)"

"Tailbud stage that refers to the earlier events associated with this stage, comprising Nieuwkoop and Faber stages 22 to 28."

"NF stage 5 (16-cell) (Xenopus)"

"Nieuwkoop and Faber stage 5, corresponding to an embryo of age 2 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Advanced sixteen cell stage. Dorsal micromeres distinctly smaller and less pigmented than ventral ones. Macromeres entirely separated by cleavage grooves. Length: 1.4 - 1.5 mm."

"NF stage 6 (32-cell) (Xenopus)"

"Nieuwkoop and Faber stage 6, corresponding to an embryo of age 3 hr at 22-24 Celsius and having the following external morphological criteria: Advanced thirty-two cell stage. Distinction between dorsal and ventral micromeres as in preceding stage. Length: 1.4 - 1.5 mm."

"NF stage 7 (Xenopus)"

"Nieuwkoop and Faber stage 7 (64-cell stage), corresponding to an embryo of age 4 hr at 22-24 Celsius and having the following external morphological criteria: Large-cell blastula stage. In animal view about 10 micromeres along meridian. Length: 1.4 - 1.5 mm."

"NF stage 8 (Xenopus)"

"Nieuwkoop and Faber stage 8 (128-cell stage), corresponding to an embryo of age 5 hr at 22-24 Celsius and having the following external morphological criteria: Medium-cell blastula stage. Surface not yet entirely smooth. Border of animal pigment cap more diffuse at dorsal than at lateral and ventral sides. Gradual transition in cell size from animal to vegetative pole. Length: 1.4 - 1.5 mm."

"NF stage 9 (Xenopus)"

"Nieuwkoop and Faber stage 9, corresponding to an embryo of age 7 hr at 22-24 Celsius and having the following external morphological criteria: Fine-cell blastula stage. Animal cells smaller at dorsal than at ventral side. Border between marginal zone and vegetative field distinct, particularly dorsally, owing to difference in cell size. Length: 1.4 - 1.5 mm."

"NF stage 10 (Xenopus)"

"Nieuwkoop and Faber stage 10, corresponding to an embryo of age 9 hr at 22-24 Celsius and having the following external morphological criteria: Initial gastrula stage. First indication of blastopore only by pigment concentration. No formation of groove. Length: 1.4 - 1.5 mm."

"NF stage 11 (Xenopus)"

"Nieuwkoop and Faber stage 11, corresponding to an embryo of age 11 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Horse-shoe-shaped blastopore stage. Blastopore groove surrounding about half of future yolk plug and indicated at its ventral side; future yolk plug often rounded rectangular, slightly elongated in dorso-ventral direction, diameter more than two-fifths of diameter of egg (plus or minus 50 degrees of circumference). Length: 1.4 - 1.5 mm."

"NF stage 12 (Xenopus)"

"Nieuwkoop and Faber stage 12, corresponding to an embryo of age 13 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Medium yolk plug stage. Yolk plug circular; diameter somewhat less than one fourth of diameter of egg (plus or minus 25 degrees). More and less pigmented fields radiating from yolk plug. Length: 1.4 - 1.5 mm."

"NF stage 13 (Xenopus)"

"Nieuwkoop and Faber stage 13, corresponding to an embryo of age 14 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Slit-blastopore stage. Neural plate faintly delimited; slight elevation of its rostral part and slight flattening of its caudal part. Caudal part of median groove formed. Length: 1.5 - 1.6 mm."

"NF stage 14 (Xenopus)"

"Nieuwkoop and Faber stage 14, corresponding to an embryo of age 16 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Neural plate stage. Cerebral part of neural plate bent downwards, with median elevation at rostral end of median groove. Initial elevation of neural folds, most pronounced in future nucal region. Blastopore always slit-shaped. Length: 1.5 - 1.6 mm."

"NF stage 15 (Xenopus)"

"Nieuwkoop and Faber stage 15, corresponding to an embryo of age 17 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Early neural fold stage. Presumptive cement gland faintly circumscribed. Anterior part of neural plate roundish. Neural folds distinct, except medio-rostrally; initial formation of sharp inner ridges on neural folds in rhombencephalic region. Length: 1.5 - 1.6 mm."

"NF stage 16 (Xenopus)"

"Nieuwkoop and Faber stage 16, corresponding to an embryo of age 18 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Mid neural fold stage. Anterior part of neural plate rectangular; darkly pigmented eye anlagen present; neural plate sharply constricted in the middle. Inner ridges on neural folds forming angle of about 90 degrees with neural plate in rhombencephalic region. Length: 1.5 - 1.6 mm."

"NF stage 17 (Xenopus)"

"Nieuwkoop and Faber stage 17, corresponding to an embryo of age 18 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Late neural fold stage. Anterior part of neural plate oblong triangular, angles formed by eye anlagen. Neural folds approaching each other from blastopore up to anterior trunk region. Length: 1.5 - 1.6 mm."

"NF stage 2- (Xenopus)"

"Nieuwkoop and Faber stage 2-, corresponding to an embryo of age 1 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Beginning of first cleavage. First cleavage groove has not yet reached vegetal pole. Length: 1.4 - 1.5 mm."

"NF stage 6.5 (Xenopus)"

"Nieuwkoop and Faber stage 6.5, corresponding to an embryo of age 3 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Morula stage. About 48 blastomeres. In animal view about 6 micromeres along meridian. Length: 1.4 - 1.5 mm."

"NF stage 10.25 (Xenopus)"

"Nieuwkoop and Faber stage 10.25, corresponding to an embryo of age 10 hr at 22-24 Celsius and having the following external morphological criteria: Early gastrula stage. First formation of dorsal blastopore groove; the groove is still straight. Length: 1.4 - 1.5 mm."

"NF stage 10.5 (Xenopus)"

"Nieuwkoop and Faber stage 10.5, corresponding to an embryo of age 11 hr at 22-24 Celsius and having the following external morphological criteria: Crescent-shaped blastopore stage. Blastopore groove angular. Vegetal field slightly decreased in size, ventral border of future yolk plug indicated by pigment contraction. Length: 1.4 - 1.5 mm."

"NF stage 11.5 (Xenopus)"

"Nieuwkoop and Faber stage 11.5, corresponding to an embryo of age 12 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Large yolk plug stage. Blastopore groove closed ventrally; yolk plug not yet quite circular. At ventral side concentrated superficial pigment still visible. Diameter of yolk plug about a third of diameter of egg (plus or minus 40 degrees). Length: 1.4 - 1.5 mm."

"NF stage 12.5 (Xenopus)"

"Nieuwkoop and Faber stage 12.5, corresponding to an embryo of age 14 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Small yolk plug stage. Future position of neural plate and median groove indicated by darker pigment lines. Yolk plug usually ovoid, variable in size. Length: 1.4 - 1.5 mm."

"NF stage 18 (Xenopus)"

"Nieuwkoop and Faber stage 18, corresponding to an embryo of age 19 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Neural groove stage. Anterior part of neural plate narrow, more or less club-shaped, often narrower towards rostral end. Parallel neural folds in trunk region very close to each other, not yet touching. Length: 1.5 - 1.6 mm."

"NF stage 19 (Xenopus)"

"Nieuwkoop and Faber stage 19, corresponding to an embryo of age 20 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Initial neural tube stage. Neural folds touching each other, except for inconstant openings at anterior and posterior end and behind nucal region. Considerable lateral extension of brain. Lateral outline of embryo still convex. Length: 1.5 - 1.6 mm."

"NF stage 20 (Xenopus)"

"Nieuwkoop and Faber stage 20, corresponding to an embryo of age 21 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Neural folds fused, suture still present. The two eye anlagen showing through dumb-bell-shaped, eyes hardly protruding. Beginning of stretching of embryos. Lateral outline flat. Length: 1.7 - 1.8 mm."

"NF stage 21 (Xenopus)"

"Nieuwkoop and Faber stage 21, corresponding to an embryo of age 22 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Suture of neural tube completely closed. Delimitation of frontal field by pigment lines. Primary eye vesicles showing through in the form of two separate, obliquely placed oval spots; beginning of protrusion of eyes. Lateral outline of embryo just becoming concave, ventral outline flat. Length: 1.9 - 2.0 mm."

"NF stage 22 (Xenopus)"

"Nieuwkoop and Faber stage 22, corresponding to an embryo of age 24 hr at 22-24 Celsius and having the following external morphological criteria: Distinct protrusion of eyes. Initial groove between jaw- and gill-areas only at latero-dorsal side. Lateral and ventral outlines of embryo slightly concave. Anal opening displaced to ventral side. Vitelline membrane becoming wider. Length: 2.0 - 2.2 mm."

"NF stage 23 (Xenopus)"

"Nieuwkoop and Faber stage 23, corresponding to an embryo of age 1 day, 45 min at 22-24 Celsius and having the following external morphological criteria: Jaw- and gill-areas completely separated by groove. Ventral outline of embryo more concave. Length: 2.2 - 2.4 mm."

"NF stage 24 (Xenopus)"

"Nieuwkoop and Faber stage 24, corresponding to an embryo of age 1 day, 2 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Eyes protruding less far laterally than gill-area. Gill-area more prominent than jaw-area, gill-area not yet grooved. Ventral outline of embryo nicked. Tail bud discernible. Initial motor reactions to external stimulation. Length: 2.5 - 2.7 mm."

"NF stage 25 (Xenopus)"

"Nieuwkoop and Faber stage 25, corresponding to an embryo of age 1 day, 3 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Eyes protruding equally far or further laterally than gill-area. Gill-area grooved. Invagination of otic vesicle indicated by pigment spot. Beginning of fin formation. Length: 2.8 - 3.0 mm."

"NF stage 26 (Xenopus)"

"Nieuwkoop and Faber stage 26, corresponding to an embryo of age 1 day, 5 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Otic vesicle protruding. Pronephros distinctly visible. Myotomes showing through for the first time. Fin somewhat broadened at dorso-caudal end of body. Beginning of spontaneous movements. Length: 3.0 - 3.3 mm."

"NF stage 27 (Xenopus)"

"Nieuwkoop and Faber stage 27, corresponding to an embryo of age 1 day, 7 hr 15 min at 22-24 Celsius and having the following external morphological criteria: Lateral flattening of eyes. Fin transluscent, except for region behind anus. Tail bud formation accentuated in lateral outline. Length: 3.4 - 3.7 mm."

"NF stage 28 (Xenopus)"

"Nieuwkoop and Faber stage 28, corresponding to an embryo of age 1 day, 8 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Fin extending up to anus. Fin broadened and distinctly divided into outer transparent and inner translucent band. Length: 3.8 - 4.0 mm."

"NF stage 29 and 30 (Xenopus)"

"Nieuwkoop and Faber stage 29/30, corresponding to an embryo of age 1 day, 11 hr at 22-24 Celsius and having the following external morphological criteria: Gray eye cup showing through for the first time. Fin transparent up to the base over its whole length. Tail bud distinct. Length: 4.0 - 4.5 mm."

"NF stage 31 (Xenopus)"

"Nieuwkoop and Faber stage 31, corresponding to an embryo of age 1 day, 13 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Tail bud equally long as broad. Length: 4.2 - 4.8 mm."

"NF stage 32 (Xenopus)"

"Nieuwkoop and Faber stage 32, corresponding to an embryo of age 1 day, 16 hr at 22-24 Celsius and having the following external morphological criteria: Eye cup horse-shoe-shaped, standing out distinctly. Length of tail bud about 1.5 times its breadth. Length: 4.5 - 5.1 mm."

"NF stage 33 and 34 (Xenopus)"

"Nieuwkoop and Faber stage 33/34, corresponding to an embryo of age 1 day, 20 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Stomodeal invagination a shallow vertical groove. Dorsal part of eye more pigmented than ventral part; distinct melanophores in dorsal part. Melanophores appearing dorsally on the head and laterally in a row extending from just below the pronephros backwards. Length of tail bud about twice its breadth. Beginning of heart beat. Length: 4.7 - 5.3 mm."

"NF stage 35 and 36 (Xenopus)"

"Nieuwkoop and Faber stage 35/36, corresponding to an embryo of age 2 days, 2 hr at 22-24 Celsius and having the following external morphological criteria: Stomodeal invagination roundish. Eye entirely black, choroid fissure nearly closed. Formation of two gill rudiments, anterior one nipple-shaped. Melanophores appearing on back. Posterior outline of proctodeum still curved. Length of tail bud about three times its breadth. Beginning of hatching. Length: 5.3 - 6.0 mm."

"NF stage 37 and 38 (Xenopus)"

"Nieuwkoop and Faber stage 37/38, corresponding to an embryo of age 2 days, 5 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Stomodeal invagination much deeper, opening round. Both gill rudiments nipple-shaped, a branch of the anterior one indicated. Posterior outline of proctodeum straight, forming very obtuse angle with ventral border of tail myotomes. Melanophores spreading over tail. Length: 5.6 - 6.2 mm."

"NF stage 39 (Xenopus)"

"Nieuwkoop and Faber stage 39, corresponding to an embryo of age 2 days, 8 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Melanophores appearing around nasal pits. Opening of stomodeal invagination transversely elongated. Melanophores on back arranged in a superficial and a deeper layer. Outlines of proctodeum and tail myotomes forming angle of about 135 degrees. Melanophores appearing along ventral edge of tail musculature. Length: 5.9 - 6.5 mm."

"NF stage 40 (Xenopus)"

"Nieuwkoop and Faber stage 40, corresponding to an embryo of age 2 days, 18 hr at 22-24 Celsius and having the following external morphological criteria: Mouth broken through. Length of gills about twice their breadth, posterior one sometimes also showing a branch. Outlines of proctodeum and tail myotomes forming angles of 90 degrees. Beginning of blood circulation in gills. Length: 6.3 - 6.8 mm."

"NF stage 41 (Xenopus)"

"Nieuwkoop and Faber stage 41, corresponding to an embryo of age 3 days, 4 hr at 22-24 Celsius and having the following external morphological criteria: Gills broader and flatter, more laterally directed. Formation of a left-rostral and a right-caudal furrow in yolk mass; torsion of interjacent part about 45 degrees; formation of conical proctodeum, forming angle of about 60 degrees with tail myotomes. Formation of fin rostral to proctodeum; ventral outline of yolk mass and proctodeum a smooth concave line. Length: 6.7 - 7.5 mm."

"NF stage 42 (Xenopus)"

"Nieuwkoop and Faber stage 42, corresponding to an embryo of age 3 days, 8 hr at 22-24 Celsius and having the following external morphological criteria: Beginning of formation of opercular folds. Torsion of intestine about 90 degrees; proctodeum connected with yolk mass by short horizontal intestinal tube. Length: 7.0 - 7.7 mm."

"NF stage 43 (Xenopus)"

"Nieuwkoop and Faber stage 43, corresponding to an embryo of age 3 days, 15 hr at 22-24 Celsius and having the following external morphological criteria: Lateral line system becoming visible externally. Cement gland losing its pigment. Torsion of intestine about 180 degrees; proctodeum narrower, arched or S-shaped. Length: 7.5 - 8.3 mm."

"NF stage 44 (Xenopus)"

"Nieuwkoop and Faber stage 44, corresponding to an embryo of age 3 days, 20 hr at 22-24 Celsius and having the following external morphological criteria: Appearance of tentacle rudiments. Opercular folds protruding further. Coiling part of intestine showing S-shaped loop; torsion about 360 degrees. Blood-circulation in gills usually ceased (gills smaller). Length: 7.8 - 8.5 mm."

"NF stage 45 (Xenopus)"

"Nieuwkoop and Faber stage 45, corresponding to a tadpole of age 4 days, 2 hr at 22-24 Celsius and having the following external morphological criteria: Operculum partly covering gills, edge still straight. Intestine spiralized in ventral aspects, showing 1.5 revolutions. Beginning of feeding. Length: 8 - 10 mm."

"NF stage 46 (Xenopus)"

"Nieuwkoop and Faber stage 46, corresponding to a tadpole of age 4 days, 10 hr at 22-24 Celsius and having the following external morphological criteria: Edge of operculum becoming convex. Xantophores appearing on eye and abdomen. Intestine showing 2 to 2.5 revolutions. Hindlimb bud visible for the first time. Length: 9 - 12 mm."

"NF stage 47 (Xenopus)"

"Nieuwkoop and Faber stage 47, corresponding to a tadpole of age 5 days, 12 hr at 22-24 Celsius and having the following external morphological criteria: Tentacles larger. Edge of operculum forming quarter of a circle. Xantophores forming opaque layer on abdomen. Intestine showing 2.5 to 3.5 revolutions. Hindlimb bud more distinct. Length: 12 - 15 mm."

"NF stage 48 (Xenopus)"

"Nieuwkoop and Faber stage 48, corresponding to a tadpole of age 7.5 days at 22-24 Celsius and having the following external morphological criteria: Beginning of pigmentation around n. acusticus. Forelimb bud visible for the first time. Shining gold-coloured abdomen. Hindlimb bud semicircular in lateral aspect. Length: 14 - 17 mm."

"NF stage 49 (Xenopus)"

"Nieuwkoop and Faber stage 49, corresponding to a tadpole of age about 12 days at 22-24 Celsius and having the following external morphological criteria: Melanophores usually appearing around thymus gland and nerves and blood vessels of head; xantophores appearing on pericard. Forelimb bud distinct. Hindlimb bud somewhat longer, distal outline still circular, no constrictions at base. Melanophores appearing on dorsal and ventral fin. Length: 17 - 23 mm."

"NF stage 50 (Xenopus)"

"Nieuwkoop and Faber stage 50, corresponding to a tadpole of age about 15 days at 22-24 Celsius and having the following external morphological criteria: Forelimb bud somewhat oval-shaped in dorsal aspect. Hindlimb bud longer than broad, constricted at base, distal outline somewhat conical. Length: 20 - 27 mm."

"NF stage 51 (Xenopus)"

"Nieuwkoop and Faber stage 51, corresponding to a tadpole of age about 17 days at 22-24 Celsius and having the following external morphological criteria: Tentacles much longer. Forelimb bud oval-shaped in lateral aspect. Hindlimb bud conical in shape, its length about 1.5 times its breadth; melanophores appearing on it. Length: 28 - 36 mm."

"NF stage 52 (Xenopus)"

"Nieuwkoop and Faber stage 52, corresponding to a tadpole of age about 21 days at 22-24 Celsius and having the following external morphological criteria: Forelimb bud irregularly conical. Hindlimb bud showing first indication of ankle constriction and first sign of flattening of foot. Length: 42 - 56 mm."

"NF stage 53 (Xenopus)"

"Nieuwkoop and Faber stage 53, corresponding to a tadpole of age about 24 days at 22-24 Celsius and having the following external morphological criteria: Fore- and hindlimbs in paddle stage. Hindlimb whithout foot somewhat longer than broad; 4th and 5th toe indicated. Length: 50 - 60 mm."

"NF stage 54 (Xenopus)"

"Nieuwkoop and Faber stage 54, corresponding to a tadpole of age about 26 days at 22-24 Celsius and having the following external morphological criteria: All four fingers indicated; edge of hand slightly scalloped between fingers; melanophores appearing on forelimb. Length of hindlimb without foot nearly twice its breadth; all five toes indicated, the second only very slightly. Length: 58 - 65 mm."

"NF stage 55 (Xenopus)"

"Nieuwkoop and Faber stage 55, corresponding to a tadpole of age about 32 days at 22-24 Celsius and having the following external morphological criteria: Hand pronated about 90 degrees; free parts of fingers about equally long as broad. Length of hindlimb without foot about 3 times its breadth; length of cartilages of 4th and 5th toe about 4 times their breadth. Length: 70 - 80 mm."

"NF stage 56 (Xenopus)"

"Nieuwkoop and Faber stage 56, corresponding to a tadpole of age about 38 days at 22-24 Celsius and having the following external morphological criteria: Elbow and wrist clearly indicated; length of free parts of fingers 3 to 4 times their breadth. Length of cartilages of 4th and 5th toe about 6 times their breadth. Length: 70 - 100 mm."

"NF stage 57 (Xenopus)"

"Nieuwkoop and Faber stage 57, corresponding to a tadpole of age about 41 days at 22-24 Celsius and having the following external morphological criteria: Pigment-free spot appearing above "Stirnorgan". Angle of elbow more than 90 degrees; fingers stretched out in forelimb atrium, their length about 7 times their breadth. Length: 75 - 105 mm."

"NF stage 58 (Xenopus)"

"Nieuwkoop and Faber stage 58, corresponding to a tadpole of age about 44 days at 22-24 Celsius and having the following external morphological criteria: Forelimbs broken through. Guanophores appearing on abdomen and thighs (adult skin areas). All three claws present on hindlimbs. Length: 80 - 110 mm."

"NF stage 59 (Xenopus)"

"Nieuwkoop and Faber stage 59, corresponding to a tadpole of age about 45 days at 22-24 Celsius and having the following external morphological criteria: Tentacles beginning to shrivel up. Stretched forelimb reaching down to base of hindlimb. Guanophores appearing near base of forelimb (adult skin area); anterior border of adult skin area on abdomen not yet sharp; appearance of irregular dark spots on back."

"NF stage 60 (Xenopus)"

"Nieuwkoop and Faber stage 60, corresponding to a tadpole of age about 46 days at 22-24 Celsius and having the following external morphological criteria: N. olfactorius still longer than bulbus olfactorius. Guanophores appearing on lower jaw (adult skin area). Openings of gill chambers still wide. Distal half of fingers of stretched forelimb extending beyond base of hindlimb; forelimb still situated behind level of heart. Adult skin area of base of forelimb covered with guanophores; anterior border of adult skin area on abdomen sharper, reaching up to heart."

"NF stage 61 (Xenopus)"

"Nieuwkoop and Faber stage 61, corresponding to a tadpole of age about 48 days at 22-24 Celsius and having the following external morphological criteria: Head narrower. Tentacles considerably shortened, mostly curved backwards. Length of n. olfactorius equal to diameter of bulbus olfactorius. 4th arterial arch seen just in front of adult skin area of forelimb. Openings of gill chambers considerably narrowed. Forelimb at level of posterior half of heart. Adult skin area on abdomen covering posterior half of heart. Fins considerably reduced."

"NF stage 62 (Xenopus)"

"Nieuwkoop and Faber stage 62, corresponding to a tadpole of age about 49 days at 22-24 Celsius and having the following external morphological criteria: Head still somewhat broader than cranial part of trunk. Tentacles short, straight. N. olfactorius shorter than diameter of bulbus olfactorius. Corner of mouth still in front of eye. Thymus gland somewhat protruding. 3rd arterial arch ("larval aorta") seen at distance of its own diameter in front of adult skin area of forelimb. Opening of operculum reduced to curved slit. Forelimb at level of middle of heart. Anterior border of adult skin area on abdomen entirely sharp, mostly nicked medially. Ventral fin disappeared from abdomen."

"NF stage 63 (Xenopus)"

"Nieuwkoop and Faber stage 63, corresponding to a tadpole of age about 51 days at 22-24 Celsius and having the following external morphological criteria: Head narrower than trunk. Tentacles mostly disappeared. Corner of mouth at level of caudal border of eye. "Larval aorta" and thymus gland no longer externally visible. Operculum closed. Adult skin areas on abdomen and lower jaw separated by narrow band of larval skin. Forelimb at level of anterior half of heart. Fin mostly perforated near anus. Tail still slightly longer than body."

"NF stage 64 (Xenopus)"