Fig. 10.
Whole-cell recording of the HCO3−-dependent component of the response to GABA. After rupture of a gramicidin perforated patch (low Cl− patch solution), GABA (200 μm) evokes a hyperpolarization and decrease of input resistance. The response shifts to a depolarization in Cl−-free superfusate and is reversibly blocked by removal of HCO3−.