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