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embryoblast

(ĕmbrē-ə-blăst′)
n.
  1. Any of the germinal disk cells of the inner cell mass in the blastocyst that form the embryo.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.