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Cross-sections of oviduct, stained with Alcian blue and eosin. (a) Magnum–isthmus junction. The Alcian-blue-positive mucosa consists of a single layer of luminal epithelium (arrow). (b) Magnum. The mucosa consists of the luminal epithelium (arrow) and underlying tubular glands (TG). The luminal epithelium is reactive with Alcian blue. (c) Isthmus. Both the luminal epithelium (arrow) and TG are non-reactive with Alcian blue. L, lumen; Mu, muscle.
