IGF1 and myocardial infarction: Sca-1+/CD31− cell transplantation alone or IGF+HGF administration without cells increased the number of BrdU positive cells (BrdU index) in the peri-infarct and infarct zones compared to the untreated MI group (MI, 1.40+/−0.08; MI+Sca-1+/CD31, 2.44+/−0.21; MI+IGF+HGF, 1.96+/−0.14; n = 6, P<0.05).