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IBD visualized endoscopically and histologically. A. Clinically normal small intestine. B. Crohn’s disease diagnosis presented as edematous, erythemous small intestine mucosa with nearly circumferential small bowel ulceration and over-lying inflammatory exudate. C. H&E stain of normal human small intestine, D. H&E stain of Crohn’s disease marked by loss of villi, chronic inflammatory cell infiltrate extending into the submucosa, and an active inflammation in the epithelium.
