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Microscopic findings of dextran sulphate sodium (DSS)-induced colitis in the Ws/Ws and control (+/+) rat. Toluidine blue staining was performed as described in Materials and Methods. (A) Ws/Ws rat. (B) Control (+%+) rat. Some mast cells (open triangle) and macrophages (arrow) containing ingested DSS particles, with metachromasia, were detected in the mucosa and submucosa (× 400).
