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XB-STAGE-3
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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." |
1/4 
| Preceded By: mature egg stage | Succeeded By: NF stage 2- |