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Histology of buccal mucosa tissues induced by injecting U14 squamous cell carcinoma cells into mice (H&E staining; magnification, ×100). Group A, mice were administered 400 mg/kg by gavage and topically treated with 100 mg/ml Kunming tea; Group B, mice were administered 800 mg/kg by gavage and topically treated with 200 mg/ml Kunming tea; Group C, mice were administered 1,600 mg/kg by gavage and topically treated with 400 mg/ml Kunming tea.
