Factor Xa

Factor X, also known by the eponym Stuart–Prower factor, is an enzyme  of the coagulation cascade. It is a serine endopeptidase (protease group S1, PA clan). Factor X is synthesized in the liver and requires vitamin K for its synthesis.Factor X is activated, by hydrolysis, into factor Xa by both factor IX (with its cofactor, factor VIII in a complex known as intrinsic Tenase) and factor VII with its cofactor, tissue factor (a complex known as extrinsic Tenase ). It is therefore the first member of the final common pathway or thrombin pathway.