Recovery from and entry into inactivated states in wild-type and med neurons. (A and C) Wild-type and med mean fraction of available channels versus recovery interval for (A) Purkinje neurons (2 ms: WT, N = 21; med, N = 7; 500 ms: WT, N = 13; med, N = 7) and (C) cerebellar nuclear neurons (2 ms: WT, N = 20; med, N = 8; 500 ms: WT, N = 17, med, N = 5). Channels recovered from a 2-ms step according to a double exponential and from a 500-ms step according to a triple exponential. Parameters of the fits are given in Table 1. Gray circles in C are the data from med Purkinje neurons, for comparison. For some data points, error bars are smaller than the symbols. (B and D) Wild-type and med average fraction of available channels versus conditioning pulse interval for (B) Purkinje neurons (WT, N = 12; med, N = 8) and (D) cerebellar nuclear neurons (WT, N = 15; med, N = 5). Channels entered slow-inactivated states in two phases (Table 1). Gray circles in D are the data from med Purkinje neurons, for comparison. For some data points, error bars are smaller than the symbols.