at physiological concentration ( 50 microgram/ml ) , alpha 2pi inhibited the clot-promoting and prekallikrein-activating activity of hageman factor fragments , the amidolytic , kininogenase , and clot-promoting activities of plasma kallikrein , and the clot-promoting properties of activated plasma thromboplastin antecedent ( pta , factor xia ) and thrombin . alpha 2pi had minimal inhibitory effect on surface-bound activated pta and activated stuart factor ( factor xa ) .
C0015522
plasma thromboplastin antecedent
C0015524
factor xia