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. 1997 Feb 1;109(2):169–180. doi: 10.1085/jgp.109.2.169

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Nifedipine block of K⁺ currents through ShBΔ6-46 T449V channels. (A) Current traces obtained from the inside-out patch in response to voltage steps from −100 mV to −20 mV, 0 mV, and +50 mV with (bottom) and without (top) nifedipine (50 μM) in the internal solution are shown. (B) Current amplitudes measured at the end of 200-ms pulses with (closed circles) and without (open circles) nifedipine (50 μM) in the internal solution.