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Figure 8


Fig. 8. Serotonin-immunoreactive (5-HT-IR) neuroepithelial cells (NECs) of the gill filament (F) in zebrafish Danio rerio. (A) 5-HT-IR NECs along the filament in a control fish; (B) 5-HT-IR NECs along the filament at higher magnification in a hyperoxia pre-exposed fish; (C) higher magnification of double labeled 5-HT-IR with associated nerve fibers (ZN-12-IR) of the proximal filament epithelium in a control fish. Scale bars, 100 µm (A); 10 µm (B,C).