CyanobacteriaNitrogen FixationSymbiosisNitrogenaseSinorhizobium melilotiRhizobiumAcetyleneMedicago sativaSynechococcusRhizobium leguminosarumFabaceaeGenes, BacterialSynechocystisBacterial ProteinsMicrocystisAnabaenaPhylogenyRhizobiaceaeMolecular Sequence DataPlant RootsMicrocystinsNostocDNA, BacterialGene Expression Regulation, BacterialNitrogenPhycobilisomesSequence Analysis, DNAPhycocyaninRNA, Ribosomal, 16SPhotosynthesisProchlorococcusEutrophicationMutationNitrogen IsotopesNitrogen CompoundsFresh WaterMarine ToxinsNitrogen CycleBlood Urea NitrogenCircadian Rhythm Signaling Peptides and ProteinsNitrogen DioxidePhycoerythrinCylindrospermopsisPhytoplanktonReactive Nitrogen SpeciesPhycobilinsSeawaterFactor IXNodulariaLightPhenotypePhotosystem II Protein ComplexCyanotheceChlorophyllCarbonPII Nitrogen Regulatory ProteinsPhotosystem I Protein ComplexRhodophytaOscillatoriaPhycobiliproteinsWater MicrobiologyAmino Acid SequenceNitratesAphanizomenonNitrogen OxidesGenome, BacterialQuaternary Ammonium CompoundsPhototrophic ProcessesLichensBase SequenceEcosystemAmmoniaBacteriaBiomassThylakoidsSpirulinaChlorophytaGlutamate-Ammonia LigaseEukaryotaPhotosynthetic Reaction Center Complex ProteinsBiofuelsAtlantic OceanLight-Harvesting Protein ComplexesAnabaena variabilisFertilizersPigments, BiologicalTetrapyrrolesPlantsSequence AlignmentLakesSaxitoxinSpecies SpecificityRibulose-Bisphosphate CarboxylaseEvolution, MolecularPacific OceanUrobilinHarmful Algal BloomPeptides, CyclicOxidoreductasesAutotrophic Processes