Co-expression of Erα and its molecular targets in mammary epithelium. (a) Erα is detected as a red nuclear stain and SDF-1 as a yellow cytoplasmic stain. (b) The red duclear stain for Erα is surrounded by yellow cytoplasmic signal from MYC immunostaining. Arrowheads in a and b point to cells where the Colocalization is clear. (c and d) serial sections show MYC (red) and SDF-1 (green) immunostaining in the same cells. Bar = 20 microns.