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fac·tor X

in the clotting of blood, also known as: Stuart factor, Stuart-Prower factor, prothrombase, and prothrombinase. Its active form, factor Xa (EC, is formed from factor X by limited proteolysis and assists in the conversion of prothrombin to thrombin. A deficiency of factor X will lead to impaired blood coagulation.
Farlex Partner Medical Dictionary © Farlex 2012

factor X

A vitamin K-dependent enzyme which is the key protein in all—intrinsic, extrinsic, and common—coagulation pathways, converting prothrombin to thrombin.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.