Pasteels (1945) described that gastrulation i | vedclass

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(D) In birds (aves),gastrulation is a complex process involving the formation of the primitive streak. Pasteels $(1945)$ specifically described the pr

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Polyinvagination

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(D) In birds (aves),gastrulation is a complex process involving the formation of the primitive streak. Pasteels $(1945)$ specifically described the process of gastrulation in birds as occurring through the mechanism of polyinvagination. This involves the inward migration of cells from the epiblast to form the hypoblast and subsequent layers.

Pasteels $(1945)$ described that gastrulation in aves takes place by:

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