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The main hMSC outward currents involved in a faster initiation of phases 3 and 4 of hCM action potentials were examined. The hMSC currents analyzed were: (A) IKCa, (B) Idr, and (C) Ito. During an hCM action potential, Idr had the largest magnitude and area under the curve, which resulted in the greatest electrical sink effects.
