prothrombinase

Medical Dictionary

prothrombinase pro·throm·bin·ase (prō-thrŏm'bə-nās', -nāz')
n.
An enzyme that catalyzes the hydrolysis of prothrombin to thrombin. Also called factor X, Stuart factor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
prothrombinase

noun
coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors 
WordNet® 3.0, © 2006 by Princeton University.
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