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Fig. 5. Double immunofluorescence localization of H+-ATPase (green;
A,A') and Na+/K+-ATPase (red; B,B') in the
gills of a freshwater ammocoete of P. marinus with the corresponding
merged image overlaid with DAPI nuclear staining (blue) and differential
interference contrast (DIC) for orientation (C,C'). The area within the
box has been enlarged 3x. Arrows indicate apical H+-ATPase
labelling and arrowheads indicate basolateral
Na+/K+-ATPase labelling. Scale bar, 50 µm.