1. Pfizer Worldwide Research and Development, Groton, Connecticut 06340, United States
2. Ann Arbor, Michigan 48105, United States
3. Cambridge, Massachusetts 63017, United States
4. ActivX Biosciences, 11025 North Torrey Pines Road, La Jolla, California 92037, United States
5. The Skaggs Institute for Chemical Biology and Department of Chemical Physiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States