1. Department
of Medicinal Chemistry, School of Pharmacy, University of Washington, Box 357610, Seattle, Washington 98195, United States
2. Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Anschutz Medical Campus, Mail Stop C238, Aurora, Colorado 80045, United States
3. Department
of Biology, Macalester College, St. Paul, Minnesota 55105, United States
4. Program
in Structural Biology and Biochemistry, University of Colorado, Anschutz Medical Campus, Mail Stop C290, Aurora, Colorado 80045, United States