Effect of β-elemene on Fas and FasL mRNA expression in HepG2 cells. HepG2 cells were treated with various concentrations of β-elemene (10, 20 and 40 μg/mL) for 48 h, and then the mRNA expression of Fas and FasL were measured by RT-PCR assay. Values represent means ± SEM. A: blank control group; B: 10 μg/mL β-elemene group; C: 20 μg/mL β-elemene group; D: 40 μg/mL β-elemene group. This assay was done triplicate (*P<0.05, **P<0.01 versus the control group).