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Whole-cell calcium currents from smooth muscle cells isolated from rat mesenteric small arteries. Traces in (a) show (I) control current, with (II) 150 μM and (III) 500 μM heptanol and with (IV) 5 μM nifedipine; (V) shows the voltage protocol applied. n=5. Traces in (b) show (I) control current, with (II) 10 μM and (III) 30 μM 18βGA and (IV) 5 μM nifedipine; (V) shows the voltage protocol applied; n=4. Vertical bars indicate s.e.m.
