[1] Univ So Calif, Dept Pathol, Kenneth Norris Jr Comprehens Canc Ctr, Sch Med, Los Angeles, CA 90089 USA
[2] Univ So Calif, Sch Med, Dept Biochem & Mol Biol, Los Angeles, CA 90089 USA
[3] Univ So Calif, Sch Med, Dept Microbiol, Los Angeles, CA 90089 USA
[4] Univ So Calif, Sch Med, Dept Biol, Los Angeles, CA 90089 USA
[5] Univ Ulm, Dept Transfus Med, Inst Clin Transfus Med & Immunogenet, D-89081 Ulm, Germany