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tropomyosin

(trō′pə-mīə-sĭn, trŏp′ə-)
n.
  1. Any of a group of muscle proteins that bind to molecules of actin and troponin to regulate the interaction of actin and myosin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.