1. Laboratory of Experimental Pathology (B.J.D., D.E.L.), National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
2. Laboratory of Environmental Carcinogenesis/Mutagenesis (C.A.L., H.F.T., R.L.), National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
3. Myriad Genetics, Inc. (S.G.M.), Salt Lake City, Utah 84108
4. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center (W.C.W.), Durham, North Carolina 27710