1. Department of Medicine (A.S., J.M., M.R., M.B., F.B.), Endocrine Research, University Hospital Innenstadt, Ludwig Maximilians University, D-80336 Munich, Germany
2. Institute of Experimental Genetics (S.W., B.R.,M.H.d.A.), Helmholtz Center Munich, D-85746 Neuherberg, Germany
3. G.V. Montgomery Veterans Affairs Medical Center and University of Mississippi Medical Center (C.G.S.), Division of Endocrinology, Jackson, Mississippi 39216
4. Chair of Molecular Animal Breeding and Biotechnology (B.R., E.W.), Gene Center, Ludwig Maximilians University, D-81377 Munich, Germany
5. Chair of Experimental Genetics (M.H.d.A.), Technical University Munich, D-85350 Freising-Weihenstephan, Germany