Matrigel (Corning Life Science, Tewksbury, MA, USA) coated 6-well plates were seeded with hiPSCs at a density of 1×105 cells / well and cultured in PSCeasy medium (Cellapy, Beijing, China) at 37°C and 5% CO2. hiPSCs were differentiated into cardiomyocytes using the small molecule-based method as previously described [51 (link)]. Myocardial purification is performed by the lactate metabolism-selection method at day 10 post myocardial differentiation. And the cells were reseeded on new Matrigel-coated culture plates. Here, the first day of myocardial differentiation was defined as Day 1.
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