Fig. 3. Cl^– ligand-gated currents in X-organ neurons. (A) Representative current traces obtained from the same neuron in response to the EC₅₀ concentrations for Glu, GABA and HA. (B) Glu-evoked currents obtained after, during and before the superfusion of a desensitizing Glu concentration (3 µmol l^–1, upper traces); note that the HA-evoked currents modified neither the amplitude nor the time course during the Glu superfusion (bottom traces). (C) As in B, GABA superfusion (1 µmol l^–1) did not modify the HA-evoked current (bottom traces), but desensitized the GABA response (upper traces). Arrows mark the current traces obtained during the superfusion of Glu or GABA.