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Contribution of IK1 to ventricular repolarization in a 2 week-old neonate and adult mid cell assessed using an action potential voltage clamp. Panel A: Previously recorded APs from neonate or adult mid cells served as the waveform and the holding potential was −80 mV. Panel B: Superimposed current traces recorded during a train of 5 pulses in the absence and presence of 100 μM Ba2+. Panel C: Subtraction of the 2 traces in Panel B yielded the Ba2+-sensitive difference current.
