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| Factor XIa Coagulation Factor XIa | Factor XI, Activated | Activated Factor XI | Blood Coagulation Factor XI, Activated | Contact Activation Product | Factor XIa, Coagulation | XIa, Coagulation Factor Activated form of factor XI. In the intrinsic pathway, Factor XI is activated to XIa by factor XIIa in the presence of cofactor HMWK; (HIGH MOLECULAR WEIGHT KININOGEN). Factor XIa then activates factor IX to factor IXa in the presence of calcium. |