1. Division of Endocrinology, Diabetes and Metabolism, Departments of Medicine and Neurology, Beth Israel Deaconess Medical Center, and Program in Neuroscience, Harvard Medical School, Boston, MA 02215, USA.
2. Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR 97006, USA.
3. Vollum Institute, Oregon Health and Science University, Portland, OR 97201, USA.
4. Department of Psychiatry and Center for Neurobiology and Psychiatry, University of California, San Francisco, CA 94117, USA.
5. Instituto de Investigaciones en Ingenierı́a Genética y Biologı́a Molecular (CONICET) and Department of Biological Sciences, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
6. Division of Endocrinology, Diabetes, Metabolism and Molecular Medicine, Tufts–New England Medical Center, and Department of Neuroscience and Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, Boston, MA 02111, USA.