1. Department of Chemistry (B.L.S., D.D.F., M.T., C.M.B., K.B., A.S.), University of Nevada Las Vegas, Las Vegas, Nevada 89154
2. Laboratory of Signal Transduction (F.M.H.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709
3. the Department of Biochemistry and Molecular Biology (A.L.G., M.B.), The George Washington University School of Medicine, Washington D.C. 20037