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Inhibitory effects of Tyr on TNF-α, PGE2 and NO production in LPS-stimulated RAW264.7 cells. Cells were incubated with the indicated concentrations of Tyr for 24 hr and subsequently with LPS for 24 hr. The treated culture media were used to measure the concentrations of TNF-α (A), PGE2 (B) and NO (C). Data represent the mean ± S.D. (n=4). *P<0.05, ***P<0.001 significantly different from LPS group.
