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Serotonin is localized in the rim of the vascular cavity. The neurogenic niche in P. clarkii, labeled immunocytochemically for glutamine synthetase (blue) and serotonin (red). The vascular cavity is outlined by a rim of serotonin labeling, most clearly seen in (C). The additional serotonin labeling observed in (A) to the left of the niche is localized in neural terminals in the accessory lobe. (A,B) were contributed by V. Quinan. Scale bars: (A), 20 μm; (B), 10 μm; (C), 10 μm.
