|Name: NF stage 15||XAO Id: XAO:1000025|
Definition: '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.'
|Preceded By: NF stage 14||Succeeded By: NF stage 16|