Fig. 7. Potentiation of I_Cl,H in hypotonic saline. (A) Currents recorded from one fibre on jumping the voltage from –50 to –120 mV. The intervals between the different recording conditions lasted 8–10 min. (B) Amplitudes of tail currents following hyperpolarising prepulses as in A. Data from the same fibre as in A. The lines connecting the data points represent Boltzmann-fits with the following parameters, presented in the sequence control-hypotonic wash: I_max: 5.2, 8.5, 3.4 (nA); V_0.5: –110, –106, –106 (mV); k (slope factor): 13.1, 11.8, 10.0 (mV). (C) Mean osmotically induced increase in tail currents recorded after –120 mV prepulses as shown in A (f=4, l=2, N=4).