1. N. C. Wrighton, R. Chang, A. K. Kashyap, R. W. Barrett, and W. J. Dower are with Affymax Research Institute, 4001 Miranda Avenue, Palo Alto, CA 94304, USA.
2. F. X. Farrell, F. P. Barbone, L. S. Mulcahy, D. L. Johnson, and L. K. Jolliffe are in the Department of Drug Discovery Research
3. R. W. Johnson Pharmaceutical Research Institute, 1000 Route 202, Raritan, NJ 08869, USA.