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Transmembrane voltage and major currents in the cell directly under the electrode. (A) Transmembrane voltage. The cell fires an action potential at approximately 1,255 ms. (B) Potassium currents iKs and iK1. (C) Currents through the L-type calcium channel (iCaL) and the sodium/calcium exchanger (iNaCa). (D) Sodium current.
