1. Department of Medicine, University of California San Diego, La Jolla, California;
2. Veterans Affairs San Diego Healthcare System, San Diego, California;
3. Boehringer Ingelheim, Biberach an der Riss, Germany;
4. Lexicon Pharmaceuticals, Incorporated, The Woodlands, Texas; and
5. Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Würzburg, Würzburg, Germany
6. Department of Pharmacology, University of California San Diego, La Jolla, California;