![]() ![]() In protostomes, the developing zygote undergoes spiral cleavage, a process in which the cells divide at a 45° angle to one another due to a realignment of the mitotic spindle. Origin of mesoderm: pouches off gut (endoderm)Ĭleavage pattern refers to the process of cell division from one fertilized cell, the zygote, into hundreds of cells, the embryo. ![]()
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