Institution: | aThe Ronald O. Perelman Department of Dermatology and the Department of Cell Biology, New York University School of Medicine, New York, New York, 10016;bThe Department of Anatomy and Developmental Biology, St. George's Hospital Medical School, London, United Kingdom;cThe Electron Microscopy Unit, St. George's Hospital Medical School, London, United Kingdom;dDepartments of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana |