FIGURE 6.

Inactivation of Kv4 currents under symmetrical (K_out/K_in) and bi-ionic conditions (K_out/Rb_in). (A–C) Kv4 currents expressed in inside-out patches were evoked as detailed in Fig. 5 legend. (First column) In symmetrical 98 mM K⁺. (Second column) The same patch after switching the internal bath solution to 98 mM Rb⁺. (Third column) Scaled outward currents from the first and second columns at +50 mV (currents mediated by K⁺ (black) or Rb⁺ (red). (Fourth column) scaled inward currents from the first and second columns at −30 mV (both currents are mediated by K⁺). Dashed lines indicate the zero current level.