Definitions for factor xi
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plasma thromboplastin antecedent, factor XI(noun)
coagulation factor whose deficiency results in a hemorrhagic tendency
Factor XI or plasma thromboplastin antecedent is the zymogen form of factor XIa, one of the enzymes of the coagulation cascade. Like many other coagulation factors, it is a serine protease. In humans, Factor XI is encoded by the F11 gene.
U.S. National Library of Medicine
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.
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