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1,2-Dimethylhydrazine-induced colorectal tumours in rats. (A) Hyperplasia. (B) Adenoma with mild atypia. (C) Adenoma with moderate atypia. (D) Well-differentiated tubular adenocarcinomas. (E) Moderately differentiated adenocarcinomas. (F) Poorly differentiated adenocarcinomas. Haematoxylin and eosin stains (magnification, x200).
