1. Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
2. Department of Chemistry, Seattle University, Broadway and Madison, 900 Broadway, Seattle, Washington 98122
3. Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588
4. Department of Pathology, School of Medicine, University of Utah, 50 North Medical Drive, Salt Lake City, Utah 84132
5. Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003