Name: NF stage 12
XAO Id: 1000022
Definition: "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."
|Preceded By: NF stage 11.5||Succeeded By: NF stage 12.5|