1TSW:
reference: Contribution of a salt bridge to binding affinity and dUMP orientation to catalytic rate: mutation of a substrate-binding arginine in thymidylate synthase., Finer-Moore JS, Fauman EB, Morse RJ, Santi DV, Stroud RM, Protein Eng 1996 Jan;9(1):69-75. PMID: 9053905

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