Name: NF stage 37 and 38
XAO ID: 1000050
Definition: "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."
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