Effects of E2 on mRNA levels of rat CYPs. Rats were administered with EB (1 mg/kg/day), BNF (40 mg/kg/day), PB (60 mg/kg/day), DX (60 mg/kg/day), or vehicle (corn oil) for 5 days (n = 3-4/group). mRNA levels were determined by qRT-PCR. Data shown are relative CYP expression as compared to the control group (corn oil). *, p < 0.05; **, p < 0.01 vs. control.