1. Microbiology and Tumor Biology Center1 and
2. Department of Immunology, Microbiology, Pathology and Infectious Diseases,2 Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden;
3. Department of Pathology, Mount Sinai Hospital Medical School, New York, New York3; and
4. Department of Molecular Biology, The Scripps Research Institute, La Jolla, California4