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primitive node

primitive node in Medicine

primitive node n.
A knotlike thickening at the anterior end of the primitive streak of the blastoderm at the point of origin of the embryonic head. Also called Hensen's node, primitive knot.

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