SMN1 and myocardial infarction: Associated with the improvements in contractility, the CD31‐positive (CD31+) capillary and α‐smooth muscle actin‐positive (SMA+) arteriole densities in the border and infarct zones were significantly higher in the hES‐MSC treated hearts compared with the hBM‐MSC or vehicle groups at 28 days post MI (Figure 1A,B).