1. Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
2. National Institute of Neurological Diseases and Stroke, Bethesda, MD 20892
3. Department of Biochemistry and Molecular Medicine, George Washington University School of Medicine/National Institutes of Health Graduate Partnerships Program, Washington, DC 20037
4. Center for Information Technology, National Institutes of Health, Bethesda, MD 20892
5. Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742