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A 'blastocoel(e)' or 'blastocele' or 'cleavage cavity' or 'segmentation cavity' is the central region of a blastocyst. It is filled with fluid. A blastocoele forms during embryogenesis when a zygote (a fertilized ovum) divides into many cells through mitosis.
The adjectival of "blastocoel(e)" is ''blastocoelic''. A blastocoel can be described as the first cell cavity formed as the Embryo enlarges. It is essential for later gastrulation.

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See also

★ Embryo