1. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
2. Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, Michigan 48109-0600, United States
3. Department of Pathology, University of Michigan, Ann Arbor, Michigan 48109-5602, United States
4. Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109-1085, United States
5. Department of Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, Michigan 48109-2218, United States