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Immunohistochemical staining patterns of human mismatch repair protein homologue 1 (hMLH1), and phosphorylated RB (pRB) in head and neck squamous cell carcinoma (HNSCC) cell lines (A) and head and neck tissues (B). L, leukoplakia/dysplastic lesions; N, normal tissue; T, HNSCC samples. Arrow indicates the expression pattern of the corresponding proteins.
