Name: NF stage 11
XAO ID: 1000021
Definition: "Nieuwkoop and Faber stage 11, corresponding to an embryo of age 11 hr 45 min at 22-24 Celsius and having the following external morphological criteria: Horse-shoe-shaped blastopore stage. Blastopore groove surrounding about half of future yolk plug and indicated at its ventral side; future yolk plug often rounded rectangular, slightly elongated in dorso-ventral direction, diameter more than two-fifths of diameter of egg (plus or minus 50 degrees of circumference). Length: 1.4 - 1.5 mm."
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