XB-STAGE-33
Definition: Nieuwkoop and Faber stage 10.5; age 11 hr at 22-24 Celsius; corresponding to the following external morphological criteria: Crescent-shaped blastopore stage. Blastopore groove angular. Vegetal field slightly decreased in size, ventral border of future yolk plug indicated by pigment contraction. Length: 1.4 - 1.5 mm.
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