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Fig. 6. Freshwater-type mitochondria-rich (chloride) cell, `intermediate' cell and apical crypt density on the apical surface of northern (black) and southern (grey) killifish gills before (N=3) and 8 days after transfer from brackish water (10 g l-1) to freshwater (N=5). Data are expressed as means ± S.E.M. *Significant difference from brackish water control. {dagger}Significant difference from northern population (P<0.05).