Figure 6. A. Representative current/voltage relationship of TRPM8: Channels were incorporated in planar lipid bilayers of synthetic POPC, POPE (3:1) in the presence of diC16 PtdIns(4,5)P2. Experimental conditions are the same as described in the legend to Fig. 5. TRPM8 channels were stimulated with the application of 500 μM of menthol. The dashed line corresponds to the mean conductance of fully open channels, working in inward direction, this state is rarely observed due to the low open probability of this subconductance level.B: Representative current traces and all points’ histograms of outward (upper) and inward (lower) currents of TRPM8 channels with clamping potentials were +60 mV and −60 mV, respectively. Experimental conditions are the same as in the legend to figure 6A. C: Open probability of TRPM8 channels operating in inward and outward directions measured at +100 mV and −100 mV. Data were analyzed from a total of 9 experiments. D:Menthol dose response of the open probability of TRPM8. Demonstrated Po values were obtained at 100 mV. Data were analyzed from a total of 36 experimens.