[1] Natl Jewish Ctr Immunol & Resp Med, Howard Hughes Med Inst, Dept Immunol, Denver, CO 80206 USA
[2] Natl Jewish Hlth, Integrated Dept Immunol, Denver, CO 80206 USA
[3] Vrije Univ Amsterdam, Med Ctr, Dept Mol Cell Biol, Amsterdam, Netherlands
[4] Univ Colorado, Hlth Sci Ctr, Program Biomol Struct, Aurora, CO 80045 USA
[5] Univ Colorado, Hlth Sci Ctr, Dept Biochem & Mol Genet, Aurora, CO 80045 USA