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O3 exposure causes characteristic changes in airway macrophage (AM) gene expression. The union set of the light blue and royal blue dots are all significantly differentially expressed genes (2,761; FDR < 0.05). The royal blue dots alone represent those with absolute log2 fold change > 1 (773). The top 10 most highly differentially expressed genes are labeled (n = 13,594 genes tested). FDR, false-discovery rate.
