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Effect of ATRA on MSCs proliferation. MSCs were treated with various concentrations of ATRA for 24 and 48 hours and their viability were examined by MTT assay. MTT results indicated that MSCs viability and proliferation increased by ATRA compared to the control group. Data are represented as the mean±SEM (n=8). *P<.05, **P<.01, ***P<.001, compared with control
