ExoGATA-4 improves cardiac function and reduces infarction size after transplantation for 4 weeks. A, Representative echocardiography images. B, Parameters of cardiac function calculated from M-mode echocardiograms. C, Heart sections stained with Masson-Trichome (C1) and quantitative data of LV thickness and fibrosis (C2). #, p < 0.05 vs sham animals; *, p < 0.05 vs ligation control; ‡, p < 0.05 vs ExoNull treatment, respectively.