1. Laboratory of Neural Plasticity, Faculties of Medicine and Science, Brain Research Institute, University of Zurich 8057 Zurich, Switzerland;
2. Functional Genomics Center Zurich, University of Zurich, Eidgenössiche Technische Hochschule Zurich, Zurich 8057, Switzerland;
3. Division of Endocrinology, Metabolism & Lipid Research, Washington University School of Medicine, St. Louis, MO 63108