eived sham irradiation . Compared to the control-placebo group, the irradiated subjects showed increases in anhedonia ratings at two time points: during the 3-week baseline period and during weeks 1015 of stress/drug exposure. c. Affiliation scores during acute intruder stress on week 15. Intruder stress at week-15 Author Contributions Conceived and designed the experiments: TP HS AD JC RH. Performed the experiments: TP KK NJ CL LT DH GR. Analyzed the data: 
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