title: Activation of human factor XI (plasma thromboplastin antecedent) by factor XIIa (activated Hageman factor).
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002241:Carbohydrates / Q000032:analysis; D002417:Cattle; D004220:Disulfides / Q000032:analysis; D004789:Enzyme Activation; D005172:Factor XI / Q000302:isolation & purification / Q000378:metabolism; D005174:Factor XII / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D008970:Molecular Weight; D013045:Species Specificity
chemical_list: D000596:Amino Acids; D002241:Carbohydrates; D004220:Disulfides; D005174:Factor XII; D005172:Factor XI