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Figure 2: Cell viability of PC12 cells after exposure to different concentrations of fractions (0–50 mg/ml) from N. sativa hexane extract. Cell viability was determined by 3(4,5dimethylthiazol2yl)2,5diphenyltetrazolium bromide assay. Data are expressed as the mean ± standard error of the mean of three separate experiments (n = 3) 
