1. Department of Internal Medicine, School of Medicine, University of Michigan, Ann Arbor 48109
2. Department of Biological Chemistry, School of Medicine, University of Michigan, Ann Arbor 48109
3. Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor 48109
4. Department of Chemistry, College of Literature, Science, and the Arts, University of Michigan, Ann Arbor 48109