Pentamidine, dofetilide, nifedipine and doxorubicin were purchased from Sigma-Aldrich. The 10 mM stock solutions were prepared in dimethyl sulfoxide (DMSO). Drug dilutions were performed in pre-warmed (37 °C) cardiomyocytes medium. Data of control with DMSO are reported in Supplementary Fig. S2.
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