[1] Lab Mol Biol & Immunol, Immunoregulat Sect, Baltimore, MD USA
[2] Genentech Inc, Dept Immunol, San Francisco, CA 94080 USA
[3] La Jolla Inst Allergy & Immunol, Div Immune Regulat, La Jolla, CA USA
[4] NIA, Nonhuman Primate Core Facil, Translat Gerontol Branch, Baltimore, MD 21224 USA
[5] Univ Copenhagen, Dept Int Hlth Immunol & Microbiol, Lab Expt Vaccinol, DK-1168 Copenhagen, Denmark
[6] NCI, Expt Transplantat & Immunol Branch, Bethesda, MD 20892 USA
[7] NIA, Longitudinal Studies Sect, Translat Gerontol Branch, Baltimore, MD 21224 USA