1. From the Division of Intramural Research (J.S., B.Y., J.A.B., J.G., L.M.D, S.G., R.G., J.F., E.M., D.C.Z.), NIEHS/NIH, Research Triangle Park, NC; the Department of Entomology and Cancer Research Center (J.N., B.D.H.), University of California, Davis; and the Department of Medicine (L.M., H.A.R., D.C.Z.), Duke University Medical Center, Durham, NC.