FIG. 3.

Events of GABA release depended on intracellular calcium. A: GABAergic current events were recorded from DA cells in which [Ca²⁺]_i was 38 (top), 100 (middle), and 350 nM (bottom) in CsCl-based pipette solution. Holding potential was –60 mV. Insets: averaged current events with 38 (n = 19), 100 (n = 80), and 350 nM (n = 90) [Ca²⁺]_i. B: comparison of frequency (left) and mean amplitude (right) of GABAergic currents. Frequency was significantly increased when [Ca²⁺]_i was set at 100 nM (P < 0.005). The increment in [Ca²⁺]_i had no significant effect on event amplitude.