Previously, mesenchymal cells derived from menstrual blood (MMC) were shown to ameliorate cardiac fibrosis via inhibition of EndMT in myocardial infarction.60 The authors showed that the total number of cells co‐expressing CD31 and ɑSMA in the infarcted heart was reduced from 30% in the control group to 20% in the group treated with MMC. This evidence concerns the gene PECAM1 and myocardial infarction.