Gastrulation is a process common to nearly all metazoan organisms during which an embryo with distinct tissue layers develops out of a seemingly unstructured assembly of cells referred to as 'blastula ...
Jusque-là sphérique, l'embryon s'invagine pour former une nouvelle cavité interne (en plus du blastocèle préexistant) : l'archentéron, futur tube digestif. À la fin de cette étape, la gastrula adopte ...
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