1Q5P:
reference: Do enzymes change the nature of transition states? Mapping the transition state for general acid-base catalysis of a serine protease., Bott RR, Chan G, Domingo B, Ganshaw G, Hsia CY, Knapp M, Murray CJ, Biochemistry 2003 Sep 16;42(36):10545-53. PMID: 12962477

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