Affiliation: | (1) Department of Chemistry, University of Virginia, 22901 Charlottesville, Virginia, USA;(2) Department of Microbiology and Beirne Center for Immunological Research, University of Virginia School of Medicine, 22901 Charlottesville, Virginia, USA;(3) Laboratory of Cell Biology, National Cancer Institute, NIH, 20892 Bethesda, Maryland, USA;(4) Cytel Corporation, 3525 John Hopkins Court, 92121 San Diego, California, USA |