University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of Minnesota - Twin Cities, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, Pennsylvania State University, University of California, San Francisco (UCSF), University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, Pennsylvania State University - Center for Molecular Toxicology and Carcinogenesis, Buck Institute for Research on Aging, University of Minnesota - Minneapolis - Division of Molecular Medicine and University of California, San Francisco (UCSF) - Department of Microbiology and Immunology