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BLASTODERM
In much eggs with a bigamount of yolk, celldivision (cleavage) is restricted to a superficial layer of the fertilized egg (meroblastic cleavage). This layer is termed the blastoderm. In birds it is a flatdisc of cellsat onepole of the egg and in insects an outer layer of cells surrounding the yolk mass.
This entry appears with alow from the Vocabulary of Cell and Molecular Biology