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Example of a transient inward calcium current following a rapid voltage gated sodium current after inhibition of potassium currents and application of a 40 mV hyperpolarizing holding potential to the cell (a). Vertical bars 1 nA (top) and 0.1 V (bottom). Horizontal bar 10 ms. Current–voltage relationship of the sodium current recorded from isolated cardiomyocytes (b); such a current was observed in only 2% of cells
