Fig. 3. Representative western blots of Na⁺/K⁺-ATPase (A) and Na⁺/K⁺/2Cl^– cotransporter (B) from the gills of lake trout, brook trout and Atlantic salmon kept in 0 p.p.t. (FW) and those transferred gradually and kept in 30 p.p.t. for 3 weeks (SW). Molecular mass standards are indicated on the left.