CORIN and myocardial infarction: Although ejection fraction (EF) dropped in both groups post-MI when compared to non-MI controls, corin-Tg-MI had better EF at most study time points (p < 0.01, p < 0.05, p < 0.0001 and p < 0.0001 respectively at 24 h, 3 days, 1 week and 4 weeks) in contrast to WT-MI groups (Figure 2A).