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Superimposed action potentials of control (CTRL) and retinoic acid-treated (RA-treated) human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs). (A,B) Typical action potentials of (A) fast beating and (B) slowly beating CTRL and retinoic acid (RA)-treated hiPSC-CMs. (C) Typical action potentials during overdrive stimulation at 1 Hz. Note the expanded time scale.
