3FPF:
reference: Crystallographic snapshots of iterative substrate translocations during nicotianamine synthesis in Archaea., Dreyfus C, Lemaire D, Mari S, Pignol D, Arnoux P, Proc Natl Acad Sci U S A. 2009 Sep 22;106(38):16180-4. Epub 2009 Sep 2. PMID: 19805277

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