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Immunohistochemical staining of histone deacetlylases (HDACs) in invasive ductal carcinomas (×400). (A) HDAC1 and (B) HDAC2 were expressed in the nuclei of tumor cells. (C) HDAC3 was observed in both the cytoplasm and the nuclei. (D) HDAC6 staining was observed in the cytoplasm.
