Abstract
Factor IX (FIX) is a 70-kDa, single-chain, vitamin K-dependent glycoprotein present in trace amounts (~95 nM) in blood plasma1,2. FIX is synthesized as a zymogen that is converted to a serine protease, FIXa, by the activated form of factor XI3,4. FIXa has a central function in the intrinsic pathway of blood coagulation, in that it acts as an activator of factor X (FX), directly upstream of the common pathway1,5. Upon activation, FXa concomitantly converts prothrombin to thrombin to initiate the formation of the fibrin lattice6,7.
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