Venn diagram illustrating the number of genes that have a statistically significant association between promoter DNA methylation levels and urinary concentrations of iAs, MMAs and/or DMAs. The five most significant canonical pathways associated with the genes in each group are displayed. Major functions associated with these pathways include: 1cellular growth and development, 2inflammatory response/immune response; 3nuclear receptor signaling, 4cellular stress/injury, 5carbohydrate metabolism, 6intercellular/intracellular signaling, and 7apoptosis.