[1] Natl Yang Ming Univ, Dept Microbiol & Immunol, Taipei 112, Taiwan
[2] Natl Yang Ming Univ, Immunol Res Ctr, Taipei 112, Taiwan
[3] Chi Mei Foundat Hosp, Tainan, Taiwan
[4] Mayo Clin & Mayo Grad Sch Med, Dept Immunol, Rochester, MN 55905 USA
[5] DNAX Res Inst Mol & Cellular Biol Inc, Dept Immunobiol, Palo Alto, CA 94304 USA