AlnusNitrogen FixationPlant Root NodulationSymbiosisRoot Nodules, PlantBetulaceaeRhizobiumNitrogenaseSinorhizobium melilotiLotusFrankiaRhizobiaceaeDiarylheptanoidsRhizobium leguminosarumBradyrhizobiumMedicago sativaPlant RootsFabaceaeMedicago truncatulaAcetyleneGenes, BacterialBetulaSoybeansPhaseolusBacterial ProteinsRhizobium etliMesorhizobiumAzorhizobium caulinodansNitrogenMolecular Sequence DataCorylusLeghemoglobinFixation, OcularPlants, MedicinalNitrogen IsotopesMycorrhizaeAzotobacterPeasNitrogen CycleSesbaniaSinorhizobiumGene Expression Regulation, BacterialPII Nitrogen Regulatory ProteinsFracture FixationElettariaVicia sativaCyanotheceMedicagoAzotobacter vinelandiiKlebsiella pneumoniae