“…Neonatal murine ventricles were surgically excised and NMVMs were isolated as previously described. 39 After NMVMs beat, cells were treated with DOX (1 μM), as previously described, 31 for 24 h in the DOX group and the mito + DOX group. For mitochondrial transplantation absorption assay, 10,000 NMVMs were seeded into 96-well confocal glass bottom plates.…”