Ferric chloride–induced arterial thrombosis. (A) The time to occlude the carotid artery of Adamts13^−/− mice 5 months after transplantation with HPCs expressing GFP (HPC + GFP) and full-length murine Adamts13 (HPC + mAD13). (B) The percentage of occluded carotid arteries after 30 minutes of monitoring in all 3 groups is shown. The Student t test was performed to determine the statistical significance between each control and the experimental group. P values less than .01 and .05 indicate statistically significant difference between the 2 compared groups.