1FRX:
reference: Site-directed mutagenesis of Azotobacter vinelandii ferredoxin I: cysteine ligation of the [4Fe-4S] cluster with protein rearrangement is preferred over serine ligation., Shen B, Jollie DR, Diller TC, Stout CD, Stephens PJ, Burgess BK, Proc Natl Acad Sci U S A 1995 Oct 24;92(22):10064-8. PMID: 7479727

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