Factor X, also known by the eponym Stuart–Prower factor, is an enzyme of the coagulation cascade. It is a serine endopeptidase. Factor X is synthesized in the liver and requires vitamin K for its synthesis.

What does thrombokinase mean?

Definitions of thrombokinase. an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot. synonyms: factor III, thromboplastin. type of: clotting factor, coagulation factor. any of the factors in the blood whose actions are essential for blood coagulation.

Why is thrombokinase called Factor?

Morawitz in 1905 may have been the first to isolate Factor X when he identified a factor named 'thromboplastin' that interacted with thrombogen to form thrombin. In 1955, Duckert reported a factor deficiency distinct from FVII and FIX in patients receiving coumarins and named the new factor as Factor X.