1. Department of Drug Metabolism and Pharmacokinetics, Amgen Inc., Seattle, Washington 98119, United States
2. Department of Medicinal Chemistry, Box 357610, University of Washington, Seattle, Washington 98195-7610, United States
3. Department of Molecular Biophysics and Biochemistry, Yale University, Box 208114, New Haven, Connecticut 06520-8114, United States
4. Department of Pharmaceutics, Box 357, University of Washington, Seattle, Washington 98195-76, United States