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Effect of sterile saline (0.9%) or lipopolysaccharide (LPS) (250 μg/rat) on NOP mRNA expression in rat (a) hypothalamus, (b) basal forebrain and (c) hippocampus 4 h post-injection. Data are expressed as NOP : GAPDH ratios (mean SEM, n = 6). *P < 0.05, Mann–Whitney U-test.
