Figure 3.

Concentration-dependent effects of Ca²⁺ channel antagonists on serotonin release. The concentration-dependent effects of Ca²⁺ channel antagonists, on basal, Ca²⁺- and K⁺-evoked hippocampal serotonin releases are represented in a, b and c, respectively. The ordinates indicate the mean±s.d. (n=6) of serotonin release level (fmol sample⁻¹), and abscissas show the concentration of Ca²⁺ channel antagonists (μM). The mean values of serotonin release obtained between perfusion without (control) and with Ca²⁺ channel antagonists were compared by one-way ANOVA with Tukey's multiple comparison (*: P<0.05; **: P<0.01).