OxyhemoglobinsHemoglobinsHemoglobin, SickleCarboxyhemoglobinHemoglobin ADiphosphoglyceric AcidsHemoglobin CSpectroscopy, Near-InfraredMethemoglobinHemoglobins, Abnormal2,3-DiphosphoglycerateOxygenPhytic AcidSodium NitriteTomography, OpticalPteroylpolyglutamic AcidsAntisickling AgentsDimethylformamideProtein BindingKineticsNitritesMacromolecular SubstancesCyanatesMathematicsSpectrophotometrySpectrum AnalysisHydrogen-Ion ConcentrationNitrite ReductasesAnemia, Sickle CellBinding SitesProtein ConformationCarbon MonoxideErythrocytesCyanidesCerebrovascular CirculationOsmolar ConcentrationGelsOxygen ConsumptionInositolMagnetic Resonance ImagingBlood VolumeHemeOximetryMyoglobinAmmonium SulfateDioxinsSpectrophotometry, InfraredSolubilityMagnetic Resonance SpectroscopyCrystallizationBuffersX-Ray DiffractionModels, MolecularBrainMolecular Sequence DataElectron Spin Resonance SpectroscopyNitric OxideLigandsOxidation-ReductionTemperatureThermodynamicsCarbon DioxideIronAmino Acid SequenceHemodynamicsTime FactorsStructure-Activity RelationshipBrain MappingBase SequenceReproducibility of ResultsProtein Structure, TertiaryAlgorithmsDNA-Binding ProteinsSensitivity and SpecificityCell LineTranscription FactorsBinding, CompetitiveRecombinant ProteinsCarrier ProteinsRecombinant Fusion ProteinsPromoter Regions, GeneticSequence Homology, Amino AcidMutationDNANuclear ProteinsEscherichia coliTransfectionHeLa CellsCloning, MolecularBacterial ProteinsCrystallography, X-RayMutagenesis, Site-DirectedRNA-Binding ProteinsAmino Acid MotifsSequence AlignmentDimerizationTwo-Hybrid System TechniquesMembrane ProteinsRepressor ProteinsElectrophoresis, Polyacrylamide Gel