Factor Xa 。Factor Xa is an Land Dwelling Vertebrates attractive target for the Tissue factor Surfaces (eg collagen) design of new oral XII anticoagulants XIa because of the unique IXa role factor Xa plays in the coagulation Xa cascade as a II(prothrombin)一◆Ila(Thrombin) XIIIa connection between riorinogen-:hrin-Stabilised Fibrin the extrinsic and intrinsic pathwaysFactor Xa • Factor Xa is an attractive target for the design of new oral anticoagulants because of the unique role factor Xa plays in the coagulation cascade as a connection between the extrinsic and intrinsic pathways