EN
The effects of dark induced stress on some antioxidant enzymes and their cofactors were evaluated. The study was performed on 280 male mice. Measurements for red blood cell copper/zinc-superoxide dismutase (Cu/Zn-SOD) and catalase activities, as well as plasma and red blood cell zinc and copper concentrations were taken. Mice exposed to dark induced stress are susceptible to antioxidant enzyme activities such as Cu/Zn-SOD, catalase (CAT), plasma and red cell concentrations of zinc and copper, and were significantly different (P<0.001) compared with the values for the control group.