Fig. 8. Immunohistochemistry of consecutive sections from the trailing edge region of gills from sham-operated fish (A), acid-infused fish (B), and base-infused fish (C). (Ai,Bi,Ci) Na⁺/K⁺-ATPase immunoreactivity; (Aii,Bii,Cii) V-H⁺-ATPase immunoreactivity; (Aiii,Biii,Ciii) diagrams of the approximate location of each immunostained cell. Cells that labeled positive for Na⁺/K⁺-ATPase only are black, those labeled for V-H⁺-ATPase only are white, and cells that labeled positive for both transporters are gray. Scale bar, 10 µm.