Echocardiographic analyses (Supplementary Figure S7) performed on days 7, 14, 28 and 42 after MI induction and cell administration revealed substantial improvement of LVEF in mice injected with hiPSC-CMs-Luc-GFP, hiPSC-CMs-SDF-1-Luc-GFP and hiPSC-CMs-HO-1-Luc-GFP occurring between days 28 and 42 post-MI (Figure 6a). The gene discussed is CXCL12; the disease is myocardial infarction.