Fig. 2.

Current–voltage relationship of heat- and capsaicin-evoked currents established by voltage ramps (from +40 to −100 mV, 500 msec). The pipette solution contained Cs⁺ in place of K⁺ to eliminate voltage-activated K currents. A, Estimation of the net heat-activated I–V curve by digital subtraction of the control from the test curve. B, Averaged net I–V curves of heat-evoked currents recorded with different ionic composition of the bath solution. C, Averaged netI–V curves of capsaicin-evoked currents recorded with different ionic composition of the bath solution. Error bars show SEM for points at intervals along the curves. Reversal potentials and number of experiments are given in Table 1.