1. Gladstone Institute of Virology and Immunology, San Francisco, CA 94158, USA.
2. Department of Medicine, University of California, San Francisco, CA 94143, USA.
3. Gladstone Institute of Neurological Disease, San Francisco, CA 94158, USA.
4. Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, USA.
5. Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143, USA.
6. Sarah W. Stedman Nutrition and Metabolism Center, and Departments of Pharmacology and Cancer Biology and Medicine, Duke University Medical Center, Durham, NC 27704, USA.
7. Laboratory of Experimental Gerontology, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA.
8. Department of Chemistry, Ithaca College, Ithaca, NY 14850, USA.