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protein C

n.
  1. A vitamin K-dependent plasma protein that enzymatically cleaves activated forms of factors V and VIII, thus inhibiting the coagulation of blood and interfering with the regulation of intravascular clot formation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.