1. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892.
2. SAIC-Frederick National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892.
3. Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892.
4. Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.
5. Laboratory of Biological Modeling, National Institute of Digestive Diseases and Kidney, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892.
6. Critical Care Medicine Department, Clinical Center, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892.