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dorsal lip

noun, Embryology
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.
Origin of dorsal lip
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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