1. Pharmaceutical Sciences Division, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
2. Merck & Co., Inc., 320 Bent Street, Cambridge, Massachusetts 02141, United States
3. Department of Cell and Regenerative Biology, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
4. Human Proteomics Program, School of Medicine and Public Health, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
5. Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
6. Department of Genetics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
7. Department of Bacteriology, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States