Figure 5. Quantitative analysis of γH2AX foci in the stratum granulosum of the dentate gyrus among experimental mice 1day, 7, 120 days and 15 months after irradiation with 5Gy at P3, P10 and P21 respectively. *P<0.001; @P<0.01 #P<0.05 compared to the age-matched control, &P<0.01 compared to P3+120 or P10+120; $P<0.05 compared to P21+1E; ~ P<0.05 compared to P3+1E, P10+1E; **P<0.05 compared to P3+1E and P3+7E; ++P<0.001 compared to P3+1E; !!P=0.001 compared to P10+1E; !P<0.01 compared to P10+1E; &&P< 0.05 compared to P21+120. C: Control, E: Experimental.