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pronormoblast

(prō-nôrmə-blăst′)
n.
  1. The first of four stages in development of the normoblast.proerythroblast rubriblast
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.