[1] NCI, NIH, Expt Immunol Branch, Bethesda, MD 20892 USA
[2] NCI, NIH, Expt Transplantat & Immunol Branch, Bethesda, MD 20892 USA
[3] Sabanci Univ, Fac Engn & Nat Sci, Biol Sci & Bioengn Program, Istanbul, Turkey
[4] NCI, NIH, Immune Cell Biol Branch, Bethesda, MD 20892 USA
[5] Med Univ Vienna, Inst Immunol, Vienna, Austria
[6] NCI, Canc Res & Dev Ctr, SAIC Frederick, Frederick, MD USA
[7] Univ Penn, Immunol Grad Grp, Philadelphia, PA 19104 USA