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Measurement of PGE2 levels in MSCs. The cells were treated with 0, 1, 10 and 100 μmol/L ATRA for 24 hours. PGE2 levels in the culture medium were measured by ELISA. ATRA significantly increased PGE2 levels. Data are reported as mean±SEM (n=3). *P<.05, **P<.01, ***P<.001 vs control cells
