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Fig. 3. Immunolocalisation of AQP-3 in the gill. Typical immuno-histochemistry of the branchial epithelium in 3-week seawater (SW)-acclimated (A—C) and freshwater (FW; D—H) silver eels. (C,F) Control sections incubated with pre-immune serum. PF, primary filaments; SL, secondary lamellae; GA, gill arch; GAE, gill arch epithelium; CC, chloride cell; GC, goblet cell; PC, pillar capillary; RBC, red blood cell. Bars, 10 µm.