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When cell proliferation comes to a certain amount of cells, the cells begin to migrate. During migration, a structure called an archenteron (gastrocoel) is formed. This stage is called gastrulation. During migration, three germ layers of the embryo are also differentiated: ectoderm, mesoderm, and endoderm.Summary:• migration begins• archenteron (gastrocoel) formation• germ layer formation: ectoderm, mesoderm, andoderm

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