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Circulating interleukin-6 (IL-6) response to lipopolysaccharide (LPS) 2 days after chronic mild stress (CMS). Mean IL-6 concentrations for each group at 0 and 2 h after LPS injection. Error bars indicate SEM. Sample size for each group is in the key. Clustered rats had a significant greater acute IL-6 response to LPS than Control rats (planned pair-wise comparisons, p < .05).
