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Fig. 5. Relative percentage of PNA and PNA+ cell types in populations of gill cells isolated from the MR 1.05–1.09 g ml–1 Percoll interface. Control fish (freshwater) are compared with seawater-adapted fish at partial-strength (10{per thousand}) and full-strength seawater (30{per thousand}). PNA+ and PNA cells counted under 100x objective of fluorescence microscope with a minimum of five fields of view counted for each freshwater and seawater fish. Values represent means ± S.E.M. (N=6 fish for each treatment group).