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Summary Stage Literature (159) Attributions Wiki

Name: NF stage 11.5

XAO ID: 1000032

Definition: "Nieuwkoop and Faber stage 11.5, corresponding to an embryo of age 12 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Large yolk plug stage. Blastopore groove closed ventrally; yolk plug not yet quite circular. At ventral side concentrated superficial pigment still visible. Diameter of yolk plug about a third of diameter of egg (plus or minus 40 degrees). Length: 1.4 - 1.5 mm."

Preceded By: NF stage 11 Succeeded By: NF stage 12