1. Department of Pharmacology, The University of Michigan Medical School, Ann Arbor,
Michigan 48109, United States
2. Skaggs School of Pharmacy and
Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
3. Department of Chemistry, Xavier University of Louisiana, New Orleans, Louisiana
70125, United States
4. Department
of Molecular Biology, The Scripps Research Institute, La Jolla, California
92037, United States