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Hypothalamic-pituitary-adrenal (HPA)-axis activation is increased in Rag1−/− mice. Serum corticosterone was measured in WT C57BL/6 and Rag1−/− mice, with or without exposure to WAS. Means ± SE; **P < 0.01 compared with WT; 1-way ANOVA, Newman-Keuls post hoc; N = 5 mice/group.
