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Expression of ATRA‐responsive genes. MEPM cells were cultured with and without 0.5 μM ATRA for up to 7 days. Expression of the genes Rarb (A), Cyp26b1 (B) and Crabp2 (C) is shown. Data are presented as mean ± SD (N = 3). **P < .01, ***P < .001, compared with the control group at each time point
