Institution: | 1.Department of Microbiology, 2.Institute for Immunology, 3.Department of Dermatology, and 4.Department of Pathology and Laboratory Medicine, Perelman School of Medicine;, and 5.Department of Pathobiology, School of Veterinary Medicine; University of Pennsylvania, Philadelphia, PA 19104;6.Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093 |