WT1 and myocardial infarction: WT1 (GFP) marked the majority of endothelial cells (CD31+CD45-) in the heart after myocardial infarction, was expressed in around 50% of the progenitor cell populations and more than half of MDSCs (CD45+Ly6-G+CD11b+) (Figure 2H, Figure S1A-E).