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Dopamine (A) and serotonin (B) presynaptic actions in control and drug-treated slices (Nife, nifedipine; Tolb, tolbutamide). Columns show means of three experiments Note that either the DA- or the 5-HT-mediated inhibition of neurotransmitter release are not significantly different from control during the different experimental conditions (P > 0.05).
