title: Preparation of nitrogenase.
mesh_terms: D001395:Azotobacter / Q000201:enzymology*; D001407:Bacillus / Q000201:enzymology*; D003460:Crystallization; D007501:Iron; D008667:Metalloproteins / Q000302:isolation & purification; D008982:Molybdenum; D009591:Nitrogenase / Q000302:isolation & purification* / Q000378:metabolism; D012247:Rhodospirillum rubrum / Q000201:enzymology*; D013045:Species Specificity
chemical_list: D008667:Metalloproteins; D008982:Molybdenum; D007501:Iron; D009591:Nitrogenase