factor vii

Medical Dictionary

factor VII n.
A factor in the clotting of blood that forms a complex with tissue thromboplastin and calcium to activate the prothrombinase, thus acting to accelerate the conversion of prothrombin to thrombin. Also called convertin, cothromboplastin, proconvertin, serum accelerator, serum accelerator globulin, serum prothrombin conversion accelerator.

The American Heritage® Stedman's Medical Dictionary
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