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Summary Stage Literature (550) Attributions Wiki

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