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Inhibitory effect of compounds on the IL-1β production in RAW 264.7 cells. Cells were stimulated with LPS (1 μg/mL) in the presence of compounds (6.25, 12.5, 25 μg/mL) for 24 h at 37 °C. Supernatants were collected, and the IL-1β production in the supernatants were determined by ELISA. Values are expressed as means ± S.D. of triplicate experiments. * p < 0.05 indicates significant differences from the LPS-stimulated group.
