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Colocalization of estrogen receptor (ER)α and cyclin D1 in mammary epithelial cells. Double immunofluorescence in the same tissue section shows: (a) ERα, green nuclear staining; (b) cyclinD1, red nuclear staining; (c) ERα and cyclinD1: yellow nuclear staining. Arrows indicate cells co-expressing ERα and cyclinD1. Bar = 20 μm.
