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Inhibitory effects of compounds (1–13) on the production of nitric oxide (NO) in lipopolysaccharide (LPS)-treated RAW264.7 cells. (a and b) Level of NO was determined by the Griess assay from culture supernatants of RAW264.7 cells treated with compounds (1–13) and LPS (1 ⊠g/ml) for 24 h (a: Right panel)
