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A. Hematoxylin and eosin stained sections evaluated for histological subtypes of breast cancer revealed multiple tumour subtypes for both Cre+ and Cre- mice treated with DMBA 12 weeks after pituitary transplant but no evidence of mammary tumors in oil-treated mice. Scale bar =50 μm. B. Table lists the number of mammary tumors per mammary histological subtype for Cre- and Cre+ mice.
