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VFA : La dépression primitif se trouve sur l'extrémité céphalique de la ligne primitiveB : Le nœud primitif se trouve sur l'extrémité caudale de la ligne primitiveC : Le nœud primitif est aussi appelée nœud de HensenD : l'endoderme correspond à l'endoderme définitifE: L'ectoderme dorsal ou ectoblaste est le premier feuillet formé lors de la gastrulation
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