Factor XIa |
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| 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. | |