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XB-STAGE-56
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Name: NF stage 42
XAO ID: 1000054 Definition: "Nieuwkoop and Faber stage 42, corresponding to an embryo of age 3 days, 8 hr at 22-24 Celsius and having the following external morphological criteria: Beginning of formation of opercular folds. Torsion of intestine about 90 degrees; proctodeum connected with yolk mass by short horizontal intestinal tube. Length: 7.0 - 7.7 mm." |
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| Preceded By: NF stage 41 | Succeeded By: NF stage 43 |