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Concentration–response relations for effects of heptanol (a, b) and 18β-glycyrrhetinic acid (c, d) on membrane potential (a, c) (differences in membrane potential after and before addition of chemicals) and on cell input resistance (b, d) (the increase in amplitude of voltage responses to 1 nA current injection). Experiments were performed under resting conditions (open circles) and during activation with noradrenaline (filled circles).
