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Cell viability of PU and LPS on RAW264.7 macrophages. (A–B) RAW264.7 cells were treated with various concentrations of PU and LPS for 24 h and 48 h. The cell viability was determined by MTT assay, as described in Materials and Methods. The data are presented as means ± SD (n = 3). (**, p < 0.01 vs. control group).
