Ingenuity Pathway Analysis (IPA) on genes modulated by BaP in G1 -enriched MCF7 cell cultures. Gene lists of 1.5-fold differentially expressed genes in different phases were imported to IPA software, which revealed the involvement of several pathways and genes in the response to BaP. Two networks are shown here. Red colour denotes up-regulation and green colour denotes down-regulation. The IPA legend is shown in Additional file 6.