[1] NCI, SAIC Frederick, Frederick Canc Res & Dev Ctr, Frederick, MD 21702 USA
[2] NCI, Lab Leukocyte Biol, Frederick Canc Res & Dev Ctr, Frederick, MD 21702 USA
[3] NCI, Mol Immunoregulat Lab, Frederick Canc Res & Dev Ctr, Frederick, MD 21702 USA
[4] NIA, Immunol Lab, Baltimore, MD 21224 USA
[5] Immunex Corp, Seattle, WA USA
[6] Hood Coll, Dept Biol, Frederick, MD 21701 USA
[7] Seattle Genet, Bothell, WA USA