Fig. (6) Loss of mitochondrial potential as an early marker of apoptosis, A) HeLa cells, B) C33A, decrease in reduced glutathione level C) HeLa cells, D) C33A cells, E) oxidative stress (2’-7’-dichlorodihydro-fluorescein diacetate staining in HeLa cells and C33A cells incubated with tested compounds (50µM).