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Photomicrographs of Masson trichrome stained sections in the colon. (a) The control group and (b) NC group both reveal fine collagen fibers (arrowhead) in the submucosa. (c) UC group shows a large amount of collagen fibers in the mucosa and submucosa. The collagen fibers in the submucosa are interrupted by edema. (d) UC+NC group shows fine collagen fibers in the submucosa (Masson trichrome X100).
