IFNG and myocardial infarction: LVEF and LVFS in 4-weeks’ echocardiography were significantly improved in the MI+IFN-γ-Exo group compared with those in the MI+PBS and MI+Ctrl-Exo groups, while the 2-weeks’ result showed no difference between the MI+IFN-γ-Exo and MI+Ctrl-Exo groups (Fig. 3C).