Xenopus Anatomy Ontology: Summary for NF stage 22

Summary

Stage Literature (185)

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XB-STAGE-40

Name: NF stage 22

XAO Id: XAO:1000038

Definition: Nieuwkoop and Faber stage 22; age 24 hr at 22-24 Celsius; corresponding to the following external morphological criteria: Distinct protrusion of eyes. Initial groove between jaw- and gill-areas only at latero-dorsal side. Lateral and ventral outlines of embryo slightly concave. Anal opening displaced to ventral side. Vitelline membrane becoming wider. Length: 2.0 - 2.2 mm.

Preceded By: NF stage 21

Succeeded By: NF stage 23