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Fig. 4. Immuno-localisation of AQP-3 in the intestinal and rectal epithelia. Typical immuno-histochemistry of both the intestinal (A—C) and rectal (D—F) epithelium of 3-week seawater (SW)-acclimated (A,D,F) and freshwater (FW; B,C,E) silver eels. (C,F) Control sections were incubated with pre-immune serum. IE, intestinal epithelium; RE, rectal epithelium; L, lumen; GC, goblet cell; RBC, red blood cell. Bars, 10 µm.