6FD1:
reference: Structure of Azotobacter vinelandii 7Fe ferredoxin at 1.35 A resolution and determination of the [Fe-S] bonds with 0.01 A accuracy., Stout CD, Stura EA, McRee DE, J Mol Biol 1998 May 8;278(3):629-39. PMID: 9600844

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