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Cytotoxicity effect of different concentrations of Tripleurospermum disciforme and Dracocephalum multicaule extract on PC12 cells using MTT (3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay. *P < 0.05 compared with control values. (One-way analysis of variance test)
