1RXG:
reference: Structure of a cephalosporin synthase., Valegard K, van Scheltinga AC, Lloyd MD, Hara T, Ramaswamy S, Perrakis A, Thompson A, Lee HJ, Baldwin JE, Schofield CJ, Hajdu J, Andersson I, Nature 1998 Aug 20;394(6695):805-9. PMID: 9723623

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