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primitive streak

primitive streak in Medicine

primitive streak n.
An ectodermal ridge in the midline at the caudal end of the embryonic disk from which the intraembryonic mesoderm arises.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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