1FY8:
reference: The energetic cost of induced fit catalysis: Crystal structures of trypsinogen mutants with enhanced activity and inhibitor affinity., Pasternak A, White A, Jeffery CJ, Medina N, Cahoon M, Ringe D, Hedstrom L, Protein Sci 2001 Jul;10(7):1331-42. PMID: 11420435

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