Fig. 3
a The percentage of Arc-positive neurons in the CA1 region of the hippocampus at the 2-week time point. The percentage of Arc-positive neurons in the CA1 region of the hippocampus of sham-irradiated mice and mice irradiated with 56Fe at 0.2 Gy was higher following exposure to twice the same environment than two different environments. b. The total number of Arc-positive neurons in the CA1 region of the hippocampus at the 2-week time point. There was no significant difference in the total number of Arc-positive neurons following exposure to twice the same environment than two different environments but there was a significant difference between 0 and 0.4 Gy. *p < 0.05 versus same environment; 0 p < 0.05 versus 0 Gy. N = 5-8 mice/dose/environment