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Effects of ATRA on the cytotoxicity of HDPCs. Cells were treated with the indicated concentrations of ATRA for 24 h. Cell viability was measured using MTT assay. Data are representative of three independent experiments. *Statistically significant differences compared with the control (P<0.05). ATRA, all-trans retinoic acid; HDPC, human dental pulp cell; MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide.
