Fitted curves for wild-type and slac1-1 currents are as shown (for details, see Figs. 1 and 6). Best fittings were obtained with the voltage sensitivity coefficient (gating charge; δ), held in common in both cases, and with the voltage yielding half-maximal conductance (V1/2), held in common for IK,out, as indicated. Note the roughly 80% reduction in maximum conductance (gmax) for IK,in and its 60% enhancement for IK,out in the slac1-1 mutant.