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primitive node in Medicine

primitive node

n.
  1. A knotlike thickening at the anterior end of the primitive streak of the blastoderm at the point of origin of the embryonic head.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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