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(embryology)A meroblastic cleavage wherein the cytoplasmic divisions are restricted to the animal pole, resulting in the formation of a disc of cells confined at the animal pole or on top of the yolk.
This type of cleavage is characteristic of birds, fishes and reptiles in which their eggs contain a large amount of yolk that does not participate in cleavage.
See also: meroblastic cleavage, superficial cleavage
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