[1] Univ Calif Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94550 USA
[2] Univ Tennessee, Oak Ridge Natl Lab, Oak Ridge Sch Biomed Sci, Oak Ridge, TN 37830 USA
[3] Univ Amsterdam, Acad Med Ctr, CLB, NL-1066 CX Amsterdam, Netherlands
[4] Univ Amsterdam, Acad Med Ctr, Expt & Clin Immunol Lab, NL-1066 CX Amsterdam, Netherlands