1. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Cancer Institute (NCI), National Institutes of Health (NIH), Bethesda, MD;
2. Applied Developmental Research Directorate, SAIC-Frederick Inc, Frederick, MD;
3. Avanza Laboratories, Gaithersburg, MD;
4. Biological Resources Branch, Developmental Therapeutics Program, NCI-Frederick, Frederick, MD; and
5. Metabolism Branch, NCI, NIH, Bethesda, MD