Figure 4.

Apoptosis level after treatment of xanthorrhizol and simultaneous treatment of xanthorrhizol-curcumin as determined from Hoechst 33258 staining. The treatment for 24 h induced exponential apoptotic cell death in a dose dependent manner as compare to untreated control. Results are presented as means ± SD of 3 independent experiments. *p < 0.05, **p < 0.005 statistically significant values relative to untreated control.