Figure 4: The effect of dichlorvos and royal jelly on NO, TAC, and AI in rats. Group 1 received normal saline 0.09% as a control; group 2 received dichlorvos at 4 mg/kg/day; groups 3-5 received royal jelly at 50, 100, and 150 mg/kg, respectively; and groups 6-8 received dichlorvos at 4 mg/kg/day and royal jelly at 50, 100, 150 mg/kg, respectively. Data represent mean ± SEM. *P < 0.05 and **P < 00.1indicate significant differences compared to the control; #P < 0.05 and ##P < 0.01 relative to dichlorvos group; aP < 0.05 versus dichlorvos + royal jelly at 50 mg/kg group. NO, Nitric oxide; TAC, total antioxidant capacity; AI, apoptotic index.