Effect of FXI antisense treatment alone or in combination with Lovenox on thrombosis and bleeding in mice. Mice (n = 12/group) were treated with indicated doses of Lovenox alone (once daily for 3 consecutive days) or in combination with FXI ASO treatment (20 mg/kg twice/week for 3 weeks). Effects on FeCl3-induced IVC thrombosis (A) or tail vein bleeding (B) were determined 2 hours after the final dose of Lovenox, as described in “Anticoagulant coadministration studies.” *P < .05.