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Time course of release of dopamine, measured amperometrically. A, an amperometric recording obtained in control condition for 3 min, to measure baseline exocytosis, and with 100 μm UTP for the next 6 min. Inset: a single exocytotic event, marked with the asterisk, is displayed on an expanded time scale. B, rate of exocytosis for the same recording as the number of events per 30 s time bin.
