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Ionic currents contributing to the ventricular action potential (A) and schematic representation of a cardiomyocyte displaying (only) those proteins involved in the pathogenesis of inherited arrhythmia syndromes (B). In (A), the action potential is aligned with its approximate time of action during the ECG. In (B), ankyrin-B, an adapter protein involved in the long QT syndrome type 4, is not depicted.
