DMD-iPSC-CMs showed significantly lower Ki67-positive cells in troponin T-positive cells than Con-iPSC-CMs and Ed-DMD-iPSC-CMs (51 ± 16% vs. 26 ± 9% vs. 50 ± 14%, P < 0.05, Fig. 3D,E). The gene discussed is MKI67; the disease is Duchenne muscular dystrophy.