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Expression of the water and solute channel aquaporin 9 (red) in principal cells, and the proton pumping V-ATPase (green) in clear cells of the cauda epididymidis. In this segment, numerous clear cells express the V-ATPase in their apical membrane and sub-apical vesicles (arrows). Nuclear and spermatozoa are visualized in blue with DAPI. Scale bar: 20 μm, Inset: 5 μm.
