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PM2.5 exposure did not change COX-1 expression in endothelial cells. Mouse aorta endothelial cells were treated with PM2.5 (50 μg/ml) at different time points (0, 12, and 24 h). COX-1 mRNA expression in endothelial cells was determined by qRT-PCR. The values represent the means ± SD (n=6 in each group).
