1BO7:
reference: Energetic contributions of four arginines to phosphate-binding in thymidylate synthase are more than additive and depend on optimization of "effective charge balance"., Morse RJ, Kawase S, Santi DV, Finer-Moore J, Stroud RM, Biochemistry 2000 Feb 8;39(5):1011-20. PMID: 10653645

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