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Meaning of dorsal lip

dor'sal lip'

Pronunciation: [key]
— Embryol. Embryol.
  1. the dorsal marginal region of the blastopore, which acts as a center of differentiation: as cells move through this region to the interior of the embryo during gastrulation, they acquire the ability to induce the overlying ectoderm to develop into a variety of tissues.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.