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Germinal disc
[L. germinis - bud, offshoot]. In megalecithal eggs, the small area on the fertilized egg to which cleavage is restricted. The blastodisc results from meroblastic cleavage and develops into the embryo.
germinal disc
A small mass of active protoplasm found directly under the vitelline membrane.
gill
The respiratory organ of aquatic animals.
 See also: Bud, Shoot, Yolk, Egg, Embryo
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