About the cover: 4-Phenylimidazole docked into the active site of the CYP2B models. A, CYP2B4. B, CYP2B5. C, the interaction between the B'-C loop and helix I in CYP2B5. D, CYP2B1. The heme is shown in red. 4-Phenylimidazole is shown in yellow with the nitrogen in blue pointing to the heme iron. Mol Pharmacol59:475–484.