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Pin1 overexpression causes mammary epithelial hyperplasia in mice. The whole-mount (A) and histological (B) appearance of mammary glands derived from different ages of nonpregnant MMTV-Pin1 or control mice. The whole mounts of inguinal mammary glands were prepared, and the epithelial component was stained with carmine red. Histological sections were stained with hematoxylin and eosin.
