Fig. 1

Effect of PNEF (a) and PNWF (b) on the viability of HepG2 cells assessed by the MTT assay: Cells were treated with standard concentrations (0.01, 0.05, 0.1, 0.5 and 1 mg/ml) of PNEF and PNWF for 24 h. The results are expressed as the mean ± SD from three independent experiments. DMSO (0.5%) was used as the negative control