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Immunohistochemical expression of MSH2 repair protein in healthy oral mucosa and carcinoma cells of the invasive front of head and neck squamous cell carcinoma (HNSCC). A: Low immunohistochemical expression in basal layer of oral healthy epithelium. B/C: High immunohistochemical expression cases of HNSCC. Slides were stained with diaminobenzidine and counterstained with Mayer’s haematoxylin
