1. Institute of Molecular Animal Breeding and Biotechnology (M.B., E.W., A.H.), Gene Center, Department of Medicine Innenstadt, Ludwig-Maximilians-Universität, 80539 Munich, Germany
2. Division of Endocrine Research (M.B., I.J., F.B.), Department of Medicine Innenstadt, Ludwig-Maximilians-Universität, 80539 Munich, Germany
3. Laboratory of Mouse Genetics (M.S., A.H.), Research Institute for the Biology of Farm Animals, 18196 Dummerstorf, Germany
4. Research Unit Genetics and Biometry (D.W., A.H.), Research Institute for the Biology of Farm Animals, 18196 Dummerstorf, Germany