Effects of HO-1-MSCs transplantation on ventricular remodeling. (A) The transmural slices of the left ventricle were stained with Masson trichrome (1.25×). (B) % fibrotic area in heart with infarction was measured. Values are means ± SD of data from 6 separate experiments, *P < 0.05 compared with the hearts treated with PBS, #P < 0.05 compared with the hearts treated with Null-MSCs. (C) The border zone of the infarct area (100×).