Figure 3.

(A) A family of whole cell tail currents recorded from a lens fiber cell. The voltage clamp protocol is shown. The voltage was stepped from a holding potential of −60 mV to 80 mV for 1.5 seconds to open the hemichannels and then repolarized to voltages between −60 and +10 mV. (B) Instantaneous I–V relationship determined by measuring the isochronal tail currents. Continuous line represents the best fit of the instantaneous I–V relationship to a linear regression. (C) Time constants of deactivation plotted as a function of voltage. The time constants of deactivation were obtained by fitting the time course of deactivation of the tail currents shown in (A) to a single exponential (solid light gray lines).