Fig. 4. Quantitative comparison of voltage-sensitive K⁺ currents of Kenyon cells and projection neurons. (A) Amplitudes of K⁺ currents (elicited by a depolarizing command pulse to +50 mV) measured at the peak during transient current component (I_Peak) and during sustained current component (I_Sust; arrows in Fig. 3A) are higher in projection neuron (PN) than in Kenyon cells (KC; P<0.001). (B) The mean current density of the sustained (delayed rectifier type) current (I_Sust) is higher in projection neurons than those of Kenyon cells (P<0.01); the current densities measured at the peak currents do not differ significantly. (C) The ratio of peak (transient) versus sustained K⁺ current is higher in Kenyon cells (KC) than in projection neuron (PN, P<0.001). Levels of significance: ^*** P<0.001, ^** P<0.01.