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A, reversible inhibition of the IPSP caused by l-DOPA and DA. Only the attenuation caused by l-DOPA but not that caused by DA is blocked by pretreatment of the slices with carbidopa (300 μm). B, time course of l-DOPA (100 μm) and DA (100 μm) effects and modification of l-DOPA action by carbidopa (300 μm). Each data point in this figure represents the mean ± s.e.m. of four cells.
