1. Laboratory for Cancer Research, Department of Chemical Biology, College of Pharmacy, Rutgers, The State University of New Jersey (S.X., B.T.Z., V.T., A.H.C.), Piscataway, New Jersey 08854
2. Department of Pharmacology, University of North Carolina (I.R., R.T.), Chapel Hill, North Carolina 27599
3. Department of Veterinary Science, Center for Molecular Toxicology, Pennsylvania State University (J.M.P.), University Park, Pennsylvania 16802
4. Laboratory of Metabolism, National Cancer Institute, National Institutes of Health (F.J.G.), Bethesda, Maryland 20892