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Occludin (A, B) and claudin 2 (C, D) immunoreactions. The squamous epithelial basal cells (A) and reserve cells (B) are positive for occludin (arrows), whereas the columnar epithelial cells are negative (B). Claudin 2 is positive in squamous basal cells (C), in columnar glandular cells (D), and in reserve cells (D) (arrows). No differences are observable in the intensity of immunoreaction in claudin 2 between glandular and reserve cells (D). Bars = 50 μm.
