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A: p27Kip1 protein expression in a case of CLL. The neoplastic cells show a diffuse strong nuclear positivity. Immunoperoxidase; ×400. B: p27Kip1 protein expression in a case of DLBCL. The large neoplastic cells are completely negative for p27Kip1, whereas the small reactive T lymphocytes are positive. Immunoperoxidase; ×400.
