Tail current deactivation is slowed by duration of PB application. (Top) Family of currents triggered by 3,000 μM PB delivered over a range of PB pulse durations represented by segmented bar above (0.5 to 10 s). (Bottom, left) Replots 0.5- and 10-s responses normalized for peak tail current from top to provide comparison of deactivation time courses. Open bar marks PB application. (Bottom, right) Plots tail current decay time (time from 90 to 10% of peak amplitude) for cell in panel versus PB pulse duration (see Results). Application period was >30 s.