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Fig. 22. Sagittal sections of the gills stained with anti-Na+/K+-ATPase in chum salmon fry. A. Freshwater (FW). Both filament (arrowheads) and lamellar (arrows) MR cells are present in FW. B. Seawater (SW). In SW-adapted fish, filament MR cells (arrowheads) are well developed, but lamellar MR cells are absent. Bar: 50 μm.

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