| Institution: | 1. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE‐17177 Stockholm, Sweden.;2. Swedish Institute for Infectious Disease Control, SE‐17182 Solna, Sweden.;3. Present address: Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.;4. Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.;5. Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida 32611‐0700, USA. |
