1Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143–0795, USA.
2Department of Laboratory Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
3Division of Endocrinology, Metabolism, and Gerontology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305–5103, USA.
4Cardiovascular Research Institute and Departments of Physiology and Medicine, University of California, San Francisco, San Francisco, CA 94107, USA.
5Department of Medicine, University of California San Francisco, San Francisco, CA 94143, USA
6Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143 USA
