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Light micrographs of caput (Cap) (A,B,F), corpus (Cor) (C,G), and cauda (Cau) (D,E,H) regions of epididymis from adult (A) (C–H) and young (Y) (B) rats in zinc-fixed tissues immunostained for AQP 9. AQP 9 is localized primarily to microvilli (Mv) of principal cells (P). B, basal cells; C, clear cells; H, halo cells; IT, intertubular space; Lu, lumen. Bars: A–E = 40 μm; inset to C = 20 μm; F–H = 10 μm.
