Figure 5.

Concentration-dependent effect of verrucotoxin (VTX) on L-type Ca²⁺ currents (I_Ca(L)). I_Ca(L) recordings were obtained by applying a 500 ms depolarizing pulse from −40 to 0 mV at various concentrations. The amplitude of I_Ca(L) in the presence of VTX was normalized to that of the control current. The data represent the mean values of four experiments, and the bars indicate the s.e.m. The continuous curve is the best fit of the data using the Hill equation with a Hill coefficient of 1. See text for further details.