1. Emory Vaccine Center and Department of Microbiology and Immunology
2. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia 30322
3. Immunology Program, The Wistar Institute, Philadelphia, Pennsylvania 19104
4. College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996
5. Department of Medical Oncology, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115