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Messenger RNA expression of the pro-inflammatory cytokines (a) TNFα, (b) IL1α, and (c) IL1β in the hippocampi of mice exposed to DEPs (2, 5, or 7 h per day for 12 weeks) compared with control mice. *P < 0.05, **P < 0.01, ***P < 0.001. Each bar represents the mean ± SE (n = 6)
