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Plasma levels of corticosterone at 100 min after administration of LPS (2,500 μg/kg iv) or saline (iv) in free-feeding or food-deprived (24 h) rats exposed to an ambient temperature of 22°C. Relative changes in corticosterone are shown as the ratios between corticosterone levels in LPS-treated rats and in the corresponding saline-treated controls. The number of animals in each group is shown in parentheses. *Statistical differences between food-deprived and free-feeding rats.
