Sinorhizobium melilotiSymbiosisMedicago sativaSinorhizobiumMedicago truncatulaNitrogen FixationBacterial ProteinsSinorhizobium frediiMedicagoPlant Root NodulationGene Expression Regulation, BacterialRoot Nodules, PlantBacteriaGenome, BacterialRhizobiumGenes, BacterialRhizobiaceaePolysaccharides, BacterialPlant RootsGenomeMolecular Sequence DataDNA, BacterialSequence Analysis, DNARhizobium leguminosarumFabaceaeMelilotusLuteolinBase SequenceGenome, ViralMutationPhylogenyMutagenesis, Insertional