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Immunohistochemical staining of retinoid X receptor (RXR). Immunohistochemical staining of RXRα in human breast cancer samples is illustrated in (a–d): (a) positive cytoplasmic RXRα expression only, (b) positive nuclear and cytoplasmic RXRα expression with a nucleo-cytoplasmic IRS ratio of 8:4, (c) positive nuclear RXRα expression only, (d) negative nuclear and cytoplasmic RXRα expression; (a–d) show 25× (scale bar = 100 µm) magnification.
