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Summary Stage Literature (127) Attributions Wiki

Name: NF stage 1

XAO ID: 1000001

Definition: "Nieuwkoop and Faber stage 1, corresponding to an embryo of age 0 hr and having the following external morphological criteria: One cell stage, shortly after fertilization. Pigmentation darker ventrally than dorsally. Length: 1.4 - 1.5 mm."

Preceded By: mature egg stage Succeeded By: NF stage 2-