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a–e Immunohistochemical staining of cytokeratin expression observed in the buccal mucosa of normal control and experimental hamsters. a Higher expression of cytokeratin in DMBA alone treated group 1 hamsters. b Moderate cytokeratin expression in DMBA + hesperetin (20 mg/kg bw) treated group 2 hamsters. c–e Normal levels of cytokeratin expression in hesperetin alone group 3, CMC + liquid paraffin group 4 and normal control group 5 hamsters
