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The expression of the RAR\u03b1, RAR\u03b2, and Cx43 proteins was analyzed using immunohistochemistry in two breast cancer cell lines, MCF-7 and MDA-MB-231, and in a fibrocystic dystrophy cell line, MCF-10a, after a 48-hr exposure to 10 \u03bcM lycopene. A real-time quantitative PCR analysis was then performed to measure mRNA expression. 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