1G5P:
reference: Crystal structure of the all-ferrous [4Fe-4S]0 form of the nitrogenase iron protein from Azotobacter vinelandii., Strop P, Takahara PM, Chiu H, Angove HC, Burgess BK, Rees DC, Biochemistry 2001 Jan 23;40(3):651-6. PMID: 11170381

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