In rats pretreated with pargyline and l-tryptophan a group of neurons in the dorsomedial hypothalamus stained immunocytochemically for serotonin. These neurons measured approximately 9 μm and were distributed over a rostro-caudal distance of 900 μm. There were a total of 708 cells. No labeled cells were seen in this hypothalamic group in normal, colchicine- or pargyline-pretreated rats.
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