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Summary Stage Literature (361) Attributions Wiki

Name: NF stage 3 (4-cell)

XAO ID: 1000013

Definition: "Nieuwkoop and Faber stage 3, corresponding to an embryo of age 2 hr at 22-24 Celsius and having the following external morphological criteria: Advanced four-cell stage. Second cleavage groove has reached vegetal pole. In animal view dorsal blastomeres usually smaller than ventral ones; the latter darker than the former. Length: 1.4 - 1.5 mm."

Preceded By: NF stage 2 (2-cell) Succeeded By: NF stage 4 (8-cell)