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. Author manuscript; available in PMC: 2009 Jun 8.
Published in final edited form as: Brain Behav Immun. 2007 Aug 28;21(8):1096–1108. doi: 10.1016/j.bbi.2007.05.004

Figure 8.

Figure 8

Mean (±SEM) LPS-induced (A) plasma IL-1β, (B) plasma IL-6, and (C) plasma TNFα concentrations of adult male Wistar rats following exposure to long day (16 h light/day; LD) or short-day (8 h light/day; SD) photoperiods for 9–10 weeks. Rats were injected with 125 μg/kg E. coli LPS 30 minutes before the onset of darkness. *p<0.05 relative to baseline (0 h) value within photoperiod. #p<0.05 vs. LD value at the same time point.