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The effect of 48 h treatment with different concentrations of sodium benzoate (0.125, 0.25, 0.5, 1, 1.5, 2, 2.5, and 3 mg/mL) on viability of PC12 cells. Cell viability was determined using MTT assay. Values are expressed as mean ± S.E.M of at least three independent experiments. *Significant difference (P < 0.05) compared to the negative control group.
