1. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas 77555-1070
2. Marshfield Clinic Research Foundation, Marshfield, Wisconsin 54449
3. Department of Medical and Research Technology, University of Maryland School of Medicine
4. Veterans Administration Medical Health Care Center, Baltimore, Maryland 21201
5. Maryland Institute for Applied Environmental Health, School of Public Health and Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742
6. The Cadmus Group Inc., Iowa City, Iowa 52246