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Summary Stage Literature (172) Attributions Wiki

Name: NF stage 12.5

XAO Id: 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
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