1. Life Sciences Institute, Mary Sue Coleman Hall, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, Michigan 48109-2216, United States
2. Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, Michigan 48109-0600, United States
3. Program in Chemical Biology, Mary Sue Coleman Hall, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, Michigan 48109-2216, United States
4. Department of Medicinal Chemistry, University of Michigan College of Pharmacy, Ann Arbor, Michigan 48109-1065, United States
5. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
6. Department of Microbiology & Immunology, University of Michigan Medical School, Ann Arbor, Michigan 48109-5632, United States