1. Department of Cell and Regenerative Biology, University of Wisconsin─Madison, Madison, Wisconsin 53705, United States
2. Department of Medicine, University of Wisconsin─Madison, Madison, Wisconsin 53705, United States
3. Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
4. Department of Kinesiology, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
5. Wisconsin National Primate Research Center, University of Wisconsin─Madison, Madison, Wisconsin 53715, United States
6. Geriatric Research Education and Clinical Center, William S. Middleton Memorial Veterans Hospital, Madison, Wisconsin 53705, United States
7. Human Proteomics Program, University of Wisconsin─Madison, Madison, Wisconsin 53705, United States