1. Department of Genetic Medicine, Weill Cornell Medical College, New York, NY 10065.
2. The Departments of Chemistry and Immunology, The Scripps Research Institute, The Skaggs Institute for Chemical Biology and Worm Institute of Research and Medicine, La Jolla, CA 92037.
3. Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, La Jolla, CA 92037.
4. Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, NY 14853.