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karyomicrosome

(kăr′ē-ō-mīkrə-sōm′)
n.
  1. Any of the minute particles or granules that make up the substance of the cell nucleus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.