title: Organization of the genes for nitrogen fixation in photosynthetic bacteria and cyanobacteria.
mesh_terms: D000458:Cyanobacteria / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation; D005796:Genes; D005798:Genes, Bacterial; D007711:Klebsiella pneumoniae / Q000235:genetics* / Q000378:metabolism; D009586:Nitrogen Fixation; D012241:Rhodopseudomonas / Q000235:genetics* / Q000378:metabolism