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Arctiin inhibits the production of COX-2 (A), PGE2 (B) and mRNA (C, D) in LPS-stimulated macrophages. RAW 264.7 cells (A-C) and primary macrophages (D) were treated with different concentrations of arctiin (12.5~100 μg/ml) in the presence of LPS (100 ng/ml) and was monitored as described in 'Materials and Methods'. Each bar represents the means ± S.D. from three separate experiments. ††P< 0.01 compares to the control. *P< 0.05, **P< 0.01 compared to the LPS.
