Fig. 1. Representative time course of measured Isc
(Isc*) across split lamellae of posterior gills of C.
granulatus, showing the effects of replacing Cl- (1, by
nitrates) or Na+ (2, by choline) on both sides of the tissue. The
vertical current deflections are due to 1 mV voltage pulses and reflect the
uncorrected conductance across the preparation.