1. Inward currents in chromaffin cells were studied with the patch-clamp technique (Hamill, Marty, Neher, Sakmann & Sigworth, 1981). The intracellular solution contained 120 mM-Cs(+) and 20 mM-tetraethylammonium (TEA(+)). Na(+) currents were studied after blockade of Ca(2+) channels with 1 mM-Co(2+)...
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