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Effects of different ATRA concentrations on gene expression. MEPM cells were treated with 0, 0.1, 0.5, or 1 μM ATRA for 1 week and compared with the control group; expression of Rarb (A), Sp7 (B), and Axin2 (C) was analysed. Data are presented as mean ± SD in percentages of the control groups (N = 3). **P < .01, compared with the control group at day 7
