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Showing intestinal mucosa in juvenile groups. (A,B) Control, showing continuous layer of collagen fibers (▴) separating the mucosa of the jejunum from the musculosa and few thin fibers extending into the cores of the villi (↑). (C,D) Indomethacin (Model) group, showing discontinuous and irregular collagen fibers (▴). Mallory’s trichrome stain: (A,C) × 100, (B,D) × 400.
