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Immunohistochemical staining of p16, p53, epidermal growth factor receptor (EGFR), and Rb. All photographs are taken in high power field (×400). (A) High expression of p16, (B) low expression of p16, (C) high expression of p53, (D) low expression of p53, (E) high expression of EGFR, (F) low expression of EGFR, (G) high expression of Rb, and (H) low expression of Rb.
