1S4R:
reference: Protein kinetics: Structures of intermediates and reaction mechanism from time-resolved x-ray data., Schmidt M, Pahl R, Srajer V, Anderson S, Ren Z, Ihee H, Rajagopal S, Moffat K, Proc Natl Acad Sci U S A 2004 Apr 6;101(14):4799-804. Epub 2004 Mar 23. PMID: 15041745

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