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Co-expression of PCNA and EpCAM in a DEN-induced tumor. Magnification ×200. Note the nuclear staining of PCNA (brown) and the cytoplasmic staining of EpCAM (red) in the tumor and the co-expression in dysplastic ductal tumor cells. PCNA, proliferating cell nuclear antigen; EpCAM, epithelial cell adhesion molecule; DEN, diethylnitrosamine.
