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Effect of ZnPy (10 μM) on the voltage dependence of KCNQ4 (A and B) and KCNQ2/3 (C and D) channels expressed in CHO cells. The voltage protocol is depicted in the Inset in B. Tail current amplitudes measured within first 5 ms of the final voltage step to −60 mV were plotted against main step voltage and fitted with Boltzmann function (A and C). Examples of current traces are shown in B and D.
