Figure 2. The results of alkaline comet assay after 1.8 GHz microwave treatment with or without superposing with noise MF. A: The mean tail length (MTL). B: The mean tail moment (MTM). The MTL and MTM of comet assay induced by 1.8 GHz microwave radiation at the SAR of 3 W/kg and 4 W/kg was significantly higher than sham exposure whereas no significant differences could be observed in other exposure groups compared with the sham exposure group. The significant DNA damage induced by 3 W/kg and 4 W/kg microwave radiation was blocked by superposing with electromagnetic noise. The asterisk indicates that p<0.001.