1. Contribution from the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, Departamento de Química (and Centro de Química Fina e Biotechnologia), Faculdade de Ciências, Universidade Nova de Lisboa, 2825 Monte de Caparica, Lisboa, Portugal, Center for Metalloenzyme Studies, University of Georgia, Athens, Georgia 30602-2556, E. C. Slater Institute, Biochemistry /FS, University of Amsterdam, Plantage Muidergracht 12, NL-1018 TV Amsterdam, The Netherlands, and National Naval...