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Representative images of p16INK4A and p53 protein expression (a, b). p16INK4A and p53 IHC staining each representative of score 1 in case #13 (IHC, 20×) (c, d). p16INK4A and p53 protein expression representative of score 2 (showing patchy nuclear and/or cytoplasmic staining) and score 1 respectively in case #5 (IHC, 20×) (e, f). p16INK4A and p53 protein expression representative of score 3 (showing diffuse nuclear and cytoplasmic staining) and score 1 respectively in case #15 (IHC, 20×)
