|Name: NF stage 12.5||XAO Id: XAO:1000033|
Definition: '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.'
|Preceded By: NF stage 12||Succeeded By: NF stage 13|