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R67Q+/− myocytes have prolonged APD90 at baseline and following adrenergic stress. A. Representative action potentials from WT (left, upper), WT + isoproterenol (ISO) (right, upper), R67Q+/− (left, lower), and R67Q+/− + ISO (right, lower) at 2, 4 and 6Hz. Scale bar represents 100 ms and 10 mV.
