1UO9:
reference: The structural basis of cephalosporin formation in a mononuclear ferrous enzyme., Valegard K, Terwisscha van Scheltinga AC, Dubus A, Ranghino G, Oster LM, Hajdu J, Andersson I, Nat Struct Mol Biol 2004 Jan;11(1):95-101. Epub 2003 Dec 29. PMID: 14718929

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