To investigate the expression of Fendrr in myocardial injury, we established a mouse model of MI/R injury and observed changes in electrocardiograms (Figure 2A), serum creatine kinase (Figure 2B) levels, and hematoxylin–eosin staining (Figure 2C), which suggested that the mouse model of MI/R injury was successful. Here, FENDRR is linked to myocardial infarction.