00 nM) for 00 h followed by gene expression analysis on CYP0A0 (A), CYP0B0 (B), AhRR (C) and AhR (D). Data were normalized to control levels and are expressed as fold change of relative quantification value (RQ) in arbitrary units (AU) (mean ± SEM, N = 0, n = 0, one-way ANOVA with Tukey's post hoc test, \* significant differences in comparison to the control