An anticoagulant reversal agent; selectively binds to unfractionated heparin, enoxaparin, and Factor IXa (Kds = 28, 17, and 35 µM, respectively) over edoxaban, rivaroxaban, Factor Xa, Factor IX, thrombin, antithrombin, and fibrinogen, and only weakly binds to an enoxaparin-antithrombin complex and fondaparinux (Kds = 690 and 9,600 µM, respectively), in cell-free assays; prevents edoxaban-induced decreases in fibrin diameter in isolated human whole blood at 200 UG/ml; reduces edoxaban-, dabigatran-, apixaban-, rivaroxaban-, unfractionated heparin-, or enoxaparin-stimulated increases in tail transection-induced blood loss in rats