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Iberiotoxin-sensitive current in freshly isolated smooth muscle cells of the guinea-pig carotid artery. Left panel: original traces of the large outward current observed in the presence of intracellular calcium (0.5 μM) for a step depolarization from 0 to +60 mV and its inhibition by the presence of iberiotoxin (0.1 μM, whole cell configuration of the patch-clamp technique). Right panel: Current-voltage relationship of the iberiotoxin-sensitive current (n=5).
