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Expression of PCNA in mammary glands and spontaneous breast cancer tissues from TA2 mice. PCNA staining could be observed in the nuclei of epithelial cells from five month-old TA2 mice (4A) and spontaneous breast cancer-bearing TA2 mice (4B) (IHC, 400×). PCNA staining was present in the nuclei of spontaneous breast cancer cells from TA2 mice (4C) (IHC, 400×).
