[1] Univ Bergen, Haukeland Univ Hosp, Dept Pediat, N-5021 Bergen, Norway
[2] Univ Chicago, Howard Hughes Med Inst, Chicago, IL 60637 USA
[3] Univ Chicago, Dept Biochem & Mol Biol, Chicago, IL 60637 USA
[4] Univ Chicago, Dept Med, Chicago, IL 60637 USA
[5] Univ Chicago, Dept Human Genet, Chicago, IL 60637 USA
[6] Univ Bergen, Haukeland Univ Hosp, Ctr Med Genet & Mol Med, N-5021 Bergen, Norway
[7] Univ Penn, Sch Med, Dept Biochem & Biophys, Philadelphia, PA 19104 USA
[8] Univ Penn, Sch Med, Diabet Res Ctr, Philadelphia, PA 19104 USA
[9] Ist Sci San Raffaele, I-20132 Milan, Italy
[10] Univ Oslo, Natl Hosp, Inst Immunol, Oslo, Norway
[11] Vanderbilt Univ, Dept Mol Physiol & Biophys, Nashville, TN 37232 USA