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Fig. 3. (A) Identification of PNA+ and PNA– negative
mitochondria-rich cells (MRCs) in gill sections from adult rainbow trout.
PNA+ MRCs are labelled with arrows; stars indicate
PNA– MRCs. MRCs were identified on the basis of
immunoreactivity against Na+/K+-ATPase (red); green
indicates apical PNA and blue indicates nuclei (DAPI). (B) Higher
magnification image of a PNA (green)-positive MRC. Negative controls included
(C) omission of primary antibody against Na+/K+-ATPase
and of biotinylated PNA. The image in C was captured using the same exposure
and microscope settings as in A. Scale bar in A, 20 µm; and in B, 5
µm.