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Fig. 5. Immunohistochemical localization of the UT (stained brown) in the turtle
kidney using the affinity-purified UT antibody. Using the anti-turtle UT and
anti-Na+,K+-ATPase antibodies in adjacent mirror
sections, immunoreactivity for UT and Na+,K+-ATPase was
detected on the apical cell membrane of epithelia along the late distal tubule
(A) and the distal nephron (B), respectively. In contrast, in adjacent mirror
sections immunolabeling with the turtle UT and the H+-ATPase
antibodies was observed in the apical membrane of some epithelial cells in the
late distal tubules (C) and in the intercalated cells along the late distal
tubules (D), respectively. In C and D, filled and open arrowheads show the UT
and H+-ATPase immunopositive tubules, and H+-ATPase
immunopositive cells along the distal tubules, respectively. In adjacent
mirror sections, no UT immunoreactivity was detected in the collecting duct
(E) where H+-ATPase was expressed (F). Abbreviations: G,
glomerulus; ED, early distal tubule; LD, late distal tubule; P, proximal
tubule. Scale bars for A–F, 50 µm.