A, expanded representative recordings of tail currents of native RMCA ScTx1-sensitive Kv, Kv2.1, Kv2.1/Kv9.2 and Kv2.1/Kv9.3 channels at −45 mV following steps to +25 mV at 22°C. Continuous lines through each recording represent the best fit using a two-exponential function. B, superimposed tail current recordings from panel A with currents for Kv2.1, Kv2.1/Kv9.2 and Kv2.1/Kv9.3 normalized to value of peak tail current of native channels.