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Expression patterns of HDAC1 (A-C) and HDAC2 (D-H), which showed exclusively nuclear staining. HDAC1 showed faint staining in the nucleus of normal lymphocytes in control tissue (A) and a few lymphoma cells (B). Most tumor cells were negative for HDAC1 (C). HDAC2 showed strong nuclear staining in lymphocytes of control tissue (D). Nuclear staining in the lymphoma cells was graded as Grade 0 (E), Grade 1 (F), Grade 2 (G), and Grade 3 (H) according to the intensity of nuclear staining.
