1A6L:
reference: A T14C variant of Azotobacter vinelandii ferredoxin I undergoes facile [3Fe-4S]0 to [4Fe-4S]2+ conversion in vitro but not in vivo., Gao-Sheridan HS, Kemper MA, Khayat R, Tilley GJ, Armstrong FA, Sridhar V, Prasad GS, Stout CD, Burgess BK, J Biol Chem 1998 Dec 11;273(50):33692-701. PMID: 9837955

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