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Effects of BPE-CO2A, retinoic acid, and retinol on RXR mRNA expression in human fibroblast cultures (a) and RXR synthesis (brown precipitate) in human skin fragments labelled with anti-RXR antibodies (b) after a 48-hour incubation (40x magnification). The data represent the mean ± SD. ∗ P < 0.05, ∗∗ P < 0.01.
