the fluid-filled cavity inside a blastula 同义词：blastocoel, blastocele, segmentation cavity, cleavage cavity,
A blastocoel(e) or blastocele (also called blastocyst cavity, cleavage cavity or segmentation cavity) is the fluid-filled central region of a blastocyst. A blastocoele forms during embryogenesis when a zygote (a fertilized ovum) divides into many cells through mitosis.
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