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Effect of lipopolysaccharide (LPS) on lung fibroblast proliferation. DNA synthesis in lung fibroblasts at 0, 6, 24, 48 and 72 hrs after LPS challenge was detected by BrdU assay. *P < 0.05 indicates significant difference of the absorbance (OD450) between the LPS-challenged cells and the control cells at the same time-point. Points represent mean values (n = 3) and error bars represent SD.
