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Messenger RNA expression of the hippocampal NMDA receptor subunits (a) NR2A, b NR2B, and c NR3B in the exposure groups (2, 5, or 7 h. per day for 12 weeks) and control mice. *P < 0.05, **P < 0.01, ***P < 0.001. Each bar represents the mean ± SE (n = 6)
