Deactivation, development, and recovery from fast inactivation for the T704M. The protocols used for the T704M are the same as those described for the I1495F mutation in Figure 5.A, Tail current traces obtained from WT and T704M channels at −70 mV. B, Time constants of tail current as shown in A were plotted as a function of the test potential for WT (filled circles,n = 5) and T704M (open circles,n = 6). C, Development of fast inactivation (squares) and recovery from fast inactivation (circles) for WT (filled symbols, n = 8) and T704M (open symbols, n = 7) were obtained as described in Figure 5.