3LZC:
reference: Diphthamide biosynthesis requires an organic radical generated by an iron-sulphur enzyme., Zhang Y, Zhu X, Torelli AT, Lee M, Dzikovski B, Koralewski RM, Wang E, Freed J, Krebs C, Ealick SE, Lin H, Nature. 2010 Jun 17;465(7300):891-6. PMID: 20559380

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