University of Pennsylvania, The Wistar Institute of Anatomy and Biology, University of Pennsylvania, The Wistar Institute of Anatomy and Biology, University of Pennsylvania - Department of Microbiology and Institute for Immunology, University of California, San Francisco (UCSF), University of Pennsylvania, The Wistar Institute of Anatomy and Biology, University of Pennsylvania, The Wistar Institute of Anatomy and Biology, Buck Institute for Research on Aging, Buck Institute for Research on Aging, Burnet Institute, National Institute of Advanced Industrial Science and Technology (AIST), University of Pennsylvania, The Wistar Institute of Anatomy and Biology, University of California, San Francisco (UCSF), University of Pennsylvania - Department of Microbiology and University of Pennsylvania, The Wistar Institute of Anatomy and Biology