The multi-metal PC (PC2) was associated with the expression of NF-kB enriched genes. (A) Plot demonstrating the individual loading values of metals onto the principal component 2 (PC2) eigenvector, (B) Volcano plot demonstrating differentially expressed (BH p-value <0.1) genes in relation to the multi-metal PC, adjusted for maternal pre-pregnancy BMI, maternal smoking, maternal SES score and infant sex, with select significant genes highlighted, (C) a significantly enriched biological network identified in pathway analysis of genes that were differentially expressed in response to the multi-metal PC.