AnabaenaCyanobacteriaNitrogenDithioerythritolNitrogen CompoundsGene Expression Regulation, BacterialQuaternary Ammonium CompoundsKetoglutaric AcidsBacterial ProteinsPII Nitrogen Regulatory ProteinsNitrogen FixationSynechococcusGlutamate-Ammonia LigaseMicrocystisTranscription FactorsNitratesHelix-Turn-Helix MotifsDNA-Binding ProteinsPromoter Regions, GeneticMicrocystinsNitrate ReductaseGenes, BacterialNitrite ReductasesElectrophoretic Mobility Shift AssayBase SequenceRecombinasesTranscription, GeneticMolecular Sequence DataNitritesNitrate ReductasesNitroso CompoundsDarknessBinding SitesConsensus SequenceOperonRibulose-Bisphosphate CarboxylaseEcologyDNA FootprintingProtein BindingDNA, BacterialFerredoxinsAmino Acid SequenceCarbonAerobiosisOxidoreductasesCulture MediaLightMutationCloning, MolecularCysteineSequence Analysis, DNADNA PrimersTranscriptional ActivationOxidation-Reduction