PECAM1 and Stroke: Compared with sham-operated mice, the vehicle mice displayed an elevation in area (3.91% ± 0.52% versus 7.05% ± 0.77%, P < 0.01; 5.88% ± 0.66% versus 8.90% ± 0.84%, P < 0.05, Fig. 3b) and density (58.06 ± 8.23 versus 93.54 ± 10.53 cells/mm2, P < 0.05; 69.71 ± 11.94 versus 120.64 ± 10.56 cells/mm2, P < 0.05, Fig. 3c) of CD31-positive vessels at days 14 and 21 after stroke.