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Chronic l-dopa and 5-HT tissue content. Rats received 10 days of l-dopa or vehicle treatment. Chronic l-dopa significantly reduced 5-HT tissue content in the dorsal DRN and the PFC (*P < 0.05 compared with vehicle, Student’s t test). l-Dopa treatment did not affect the ventral DRN, striatum, or hippocampus (n = 8–12 per group).
