Fig. 1.
Total cytochrome P450 in liver microsomes from vehicle and TCDD-treated WT, hCYP1A1/1A2, and Cyp1a KO mice. Liver microsomes were prepared from vehicle (corn oil) and TCDD-treated hCYP1A1/1A2, Cyp1a KO, and WT mice (n = 4), and total cytochrome P450 content was measured as detailed in Materials and Methods. Data are presented as the mean ± S.D.; **significantly different from corresponding corn oil–treated group (unpaired t test; two-tailed P value; P < 0.01).