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factor XI

n. coagulation factor whose deficiency results in a hemorrhagic tendency [syn: plasma thromboplastin antecedent]

Factor XI

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.