MetalloproteinsChemistry, BioinorganicRubredoxinsAzurinMetalsZincCopperOxidation-ReductionElectron TransportIronApoproteinsModels, MolecularCadmiumMetallothioneinProtein EngineeringBinding SitesIron-Sulfur ProteinsProtein ConformationAmino Acid SequenceCysteineCircular DichroismMolecular Sequence DataMagnetic Resonance SpectroscopyThermodynamics