ID 3.4.21.22 DE coagulation factor IXa. AN Christmas factor. CA Selective cleavage of Arg-|-Ile bond in factor X to form factor Xa. CC -!- The proenzyme factor IX is activated by EC 3.4.21.27. CC -!- Belongs to peptidase family S1. DR P00741, FA9_BOVIN ; P19540, FA9_CANLF ; P16295, FA9_CAVPO ; DR Q804X6, FA9_CHICK ; Q6SA95, FA9_FELCA ; P00740, FA9_HUMAN ; DR P16294, FA9_MOUSE ; Q95ND7, FA9_PANTR ; P16293, FA9_PIG ; DR P16292, FA9_RABIT ; P16296, FA9_RAT ; P16291, FA9_SHEEP ; //