title: Regulation of nitrogen fixation genes.
mesh_terms: D001426:Bacterial Proteins / Q000502:physiology; D001665:Binding Sites; D004268:DNA-Binding Proteins / Q000502:physiology; D005786:Gene Expression Regulation; D005796:Genes; D005798:Genes, Bacterial; D007711:Klebsiella pneumoniae / Q000235:genetics / Q000378:metabolism; D009586:Nitrogen Fixation; D009876:Operon; D011401:Promoter Regions, Genetic; D012231:Rhizobium / Q000235:genetics / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid; D012808:Sigma Factor / Q000502:physiology
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D012808:Sigma Factor