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Ontology Definition: TS20

Theiler Stage 20 - Earliest signs of fingers


The handplate (anterior footplate) is no longer circular but develops angles which correspond to the future digits. The posterior footplate is also distinguishable from the lower part of the leg. It is possible to see the pigmentation of the pigmented layer of the retina through the transparent cornea. The tongue and brain vesicles are clearly visible.

Absent:5 rows of whiskers, indented handplate.


12 dpc (range 11.5-13)
48-51 somite pairs

Witschi Stage 28 (rat - stage table)
Carnegie - Stage 17 , (human - stage table)
Virtual Human Embryo - Stage 17

All scale bars in microns

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