1. Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States, Department of Neuroscience and Pharmacology, The Faculty of Health Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark, Department of Life Sciences, Imperial College London, London, SW7 2AZ, U.K., Department of Biochemistry and Biophysics, University of California, San Francisco, California 94158, United States, and Molecular and Cellular Physiology, Stanford University, Stanford, California 94305,...