The opening of the central cavity of an embryo in the early stage of development.
- Both the fate of the blastopore and early embryonic cleavage patterns vary considerably among the Bilateria and have not been assessed experimentally in many species.
- In the complementary category of the protostomes, which includes annelids and arthropods, the blastopore develops into the mouth.
- One group, including amphioxus, lampreys, sturgeons and amphibians, displays the primitive condition, with holoblastic eggs and involution of the endoderm through a blastopore.
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