title: Overview of nitrogen fixation.
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D000458:Cyanobacteria / Q000378:metabolism; D007887:Fabaceae / Q000378:metabolism; D009586:Nitrogen Fixation; D010944:Plants / Q000378:metabolism; D010946:Plants, Medicinal; D012231:Rhizobium / Q000378:metabolism; D013045:Species Specificity; D013559:Symbiosis