The concentration-dependent effect of DHS on the NPo of KCa channels. (a) Actual single channel current traces recorded in inside-out membrane patches. The dashed lines beside each trace indicate the closed state of the channels. (b) Summary of the effects of DHS. n = 6 (from three batches of cells) for each data point. Membrane potential, –30 mV. *P < 0.05 vs. control.