We validated in two cell-lines (Caco-2 and HT-29) the changes in expression of a number of genes (MT1E, NPPB, NOTCH3, CYP26A1, HEY1 and CYP1A1) found to be differentially expressed using RNAseq following infection with C. concisus UNSWCD or BAA-1457 (Supplementary Data 3). Here, CYP1A1 is linked to infection.