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tonofilament

(tŏn′ō-fĭlə-mənt)
n.
  1. A structural cytoplasmic protein, bundles of which together form a tonofibril.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.