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hnRNA

(āch′ĕn-är′ĕn-ā)
n.
  1. An extrachromosomal RNA molecule found in the nucleus, especially RNA transcribed from DNA rather than other RNA and the proteins produced from such RNA.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.