Histological cross-sections of FeCl3-injured mouse carotid arteries. A) Representative histological transverse sections of FeCl3-injured mouse carotid arteries treated with EPCs, PBMCs, or fresh culture media (control) and stained with hematoxylin and eosin. (Magnifications 20X). Arterial thrombus mass was completely occlusive in control-and PBMC-treated mice (panels A & B, n = 4) and partially occlusive in arteries from EPC-treated mice (panel C, n = 4). Panel D represent the injured artery from P-sel−/− mice treated with 500 x 103 EPCs (n = 4). B) Histogram represents the mean data ± SEM of cross-sectional area of arterial thrombi expressed as percentage of lumen area.