1. C. E. Ford, N. P. Skiba, H. Bae, C.-S. Yang, H. E. Hamm, Institute for Neuroscience and Department of Molecular Pharmacology and Biological Chemistry, Northwestern University, Chicago, IL 60611, USA.
2. Y. Daaka and R. J. Lefkowitz, Howard Hughes Medical Institute and Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
3. E. Reuveny, Department of Membrane Research and Biophysics, Weizmann Institute of Science, Rehovot 76100, Israel.
4. L. R. Shekter and R. J. Miller, Department of Pharmacological and Physiological Sciences, University of Chicago, Chicago, IL 60637, USA.
5. R. Rosal, G. Weng, R. Iyengar, Department of Pharmacology, Mount Sinai School of Medicine, New York, NY 10029, USA.