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Expression of P16INK4A in penile carcinoma. a and b correspond to an epidermoid case of the usual type moderately differentiated with HPV 31 and positive to P16INKA. c and d, poorly differentiated basaloid variant epidermoid carcinoma, positive for HPV35 and P16INK4A. e and f, usual moderately differentiated carcinoma negative to HPV with low expression of P16INK4A. g and h, basaloid carcinoma moderately differentiated negative to HPV and P16INK4A
