Functional enrichment analysis was performed in MetaCore (GeneGO, Thomson Reuters) based on mapping of the significant (p<0.05) genes in each treatment group onto built-in functional network processes. Heatmap visualizing the top 30 most differentially significant process networks (greatest std(−logpval) regulated by 7 PAH treatments (p<0.01 for at least one PAH group). Values are pval that have been transformed (−logpvalue) for pathway enrichment of treatments, where blue, white, and yellow represent −logpvalue = 0, 1.3 (p<0.05), and 2.0 (p<0.01), respectively.