1. Department of Chemistry; University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599-3290
2. Department of Chemistry; State University of New York at Buffalo; Buffalo New York 14260
3. Department of Biochemistry and Biophysics; University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599-7260
4. Center for Structural Biology, University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599
5. Northeast Structural Genomics Consortium; Buffalo New York 14260
6. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599