POU5F1 and neoplasm: Importantly, with similar AhR protein levels (Supplementary Fig. 38, lower right, Vehicle 4 versus ITE4, Vehicle 5, Vehicle 6 versus ITE 7, Vehicle 7 versus ITE 6, Vehicle 8 versus ITE 5), ITE-treated xenografts mostly had lower Oct4 levels than vehicle-treated xenografts, indicating that it was the ITE treatment but not the AhR level per se that affected the tumour growth in such an in vivo context.