[1] Univ Calif San Francisco, Dept Med, Rosalind Russell Med Res Ctr, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Microbiol, Rosalind Russell Med Res Ctr, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Immunol, Rosalind Russell Med Res Ctr, San Francisco, CA 94143 USA
[4] Univ Ljubljana, Fac Med, Inst Biochem, Ljubljana 61000, Slovenia
[5] Immunol Outpatient Clin, Vienna, Austria
[6] Max Planck Inst Med Res, Heidelberg, Germany