1. Department of Biochemistry, Michigan State University, East Lansing, MI 48824-1319, U.S.A.
2. Instituto di Chimica degli Ormoni, CNR, Milan, Italy
3. Center for Metalloenzyme Studies, University of Georgia, Athens, GA 30601-2556, U.S.A.
4. Department of Chemistry, University of Georgia, Athens, GA 30602-2556, U.S.A.
5. Michigan Biotechnology Institute, Lansing, MI 48909, U.S.A.