1M15:
reference: Refinement of the arginine kinase transition-state analogue complex at 1.2 A resolution: mechanistic insights., Yousef MS, Fabiola F, Gattis JL, Somasundaram T, Chapman MS, Acta Crystallogr D Biol Crystallogr 2002 Dec;58(Pt 12):2009-17. PMID: 12454458

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