PECAM1 and myocardial infarction: Similarly, EYFP/Pecam1 double positive cells, as well as EYFP/α-SMA positive cells were found in both border and infarct zones, and associated with “ring” structures, which indicated the incorporation of CPC-derived endothelial cells into de novo vasculature in post-MI hearts (Fig. 7E,F) and increased vasculogenesis.