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Dictionary

dor'sal lip'

Embryol.
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.

dorsalis

dorse

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