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Histopathology of N-nitrosomethylbenzylamine (NMBA)-induced epithelial lesions in rat esophagus. A, H&E sections representative of normal, hyperplasia, low-grade dysplasia, high-grade dysplasia and papilloma (magnification × 200) and B, percentage of each histological type of rat esophageal tissues. * P < 0.05; ** P < 0.01; *** P < 0.001.
