NCIt definition : Coagulation factor IX (461 aa, 52 kDa) is encoded by the human F9 gene. This protein
plays a role in the intrinsic pathway of blood coagulation through the mediation of
proteolysis that converts factor X into an active protease.;
NCIt note : Coagulation factor IX is converted from a zymogen to an active protease through a
single proteolytic cleavage by either coagulation factor XIa or a complex containing
tissue factor and coagulation factor IIVa.;