[1] Helmholtz Zentrum Munchen, Inst Diabet & Obes, Ingolstadter Landstr 1, D-85764 Neuherberg, Germany
[2] Helmholtz Zentrum Munchen, Helmholtz Diabet Ctr, Neuherberg, Germany
[3] Helmholtz Zentrum Munchen, German Ctr Diabet Res DZD, Neuherberg, Germany
[4] Univ Konstanz, Dept Biol, Constance, Germany
[5] Novo Nordisk Res Ctr Indianapolis, Indianapolis, IN 46241 USA
[6] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA
[7] Tech Univ Munich, Dept Med, Div Metab Dis, Munich, Germany
[8] Karls Univ Hosp & Clin, Eberhard Inst Expt & Clin Pharmacol & Pharmacogen, Dept Pharmacol Expt Therapy & Toxicol, D-72076 Tubingen, Germany