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Deletion of Stat3 in mammary epithelial cells of BLG–Cre/Stat3flox/− mice. Immunohistochemistry for Stat3 protein at day 2 of involution in BLG–Cre/Stat3flox/+ mammary glands (A) and BLG–Cre/Stat3flox/− mammary glands (B). Scale bar, 25 μm. (Inset) High power magnification. Scale bar, 10 μm.
