1. Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 208521;
2. Institute of Genetics, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom2;
3. Division of Pathobiology and Immunology, Oregon Health Sciences University, Beaverton, Oregon 970063;
4. Advanced BioScience Laboratories Inc., Kensington, Maryland 208954;
5. Institut Jean Godinot, 51100 Reims,5 and
6. Université Pierre et Marie Curie, Paris,6 France; and
7. Basic Research Laboratory, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 208927