1. Laboratory
of Computational Biology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
2. Department
of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0307, United States
3. National High Magnetic
Field Laboratory, Tallahassee, Florida 32310, United States
4. Department
of Chemistry, Hamilton College, Clinton, New York 13323, United States
5. Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States