Table I.

K_H channels gating parameters: effect of [K⁺]_O

Cell Type	Extensors		Flexors
	(n = 6)	(n = 8)	(n = 5)	(n = 9)
	40 mM [K+]O	200 mM [K+]O	40 mM [K+]O	200 mM [K+]O
Parameter
Gmax (nS)	0.5 ± 0.0	1.2 ± 0.1	0.5 ± 0.1	1.3a
E1/2 (mV)	−120 ± 4	−118 ± 7	−123 ± 5	−127 ± 1.1
z	1.3 ± 0.2	0.9 ± 0.1	1.9 ± 0.6	1.1 ± 0.1

Boltzmann best fit parameters (±se) of the averaged “restored” G_K-E_M relationships of Figure 6 at two external K⁺ concentrations. G_max, the asymptotic value of G_K at saturating potentials; E_1/2, the half-maximum-activation voltage; z, the effective number of gating charges (Eq. 3; see “Materials and Methods” for details).

^a This G_max value (the mean of the individual G_max values of the G_K-E_M relationships prior to G_K averaging) was fixed during the fit. The other G_max values in the table were not different from the respective means of the individual G_max.