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| Factor XI Coagulation Factor XI | Plasma Thromboplastin Antecedent | Blood Coagulation Factor XI | Antecedent, Plasma Thromboplastin | Factor XI, Coagulation | Thromboplastin Antecedent, Plasma | XI, Coagulation Factor Stable blood coagulation factor involved in the intrinsic pathway. The activated form XIa activates factor IX to IXa. Deficiency of factor XI is often called hemophilia C. |