1PQA: Trypsin With Pmsf At Atomic Resolution
reference: Trypsin revisited: crystallography AT (SUB) atomic resolution and quantum chemistry revealing details of catalysis., Schmidt A, Jelsch C, Ostergaard P, Rypniewski W, Lamzin VS, J Biol Chem 2003 Oct 31;278(44):43357-62. Epub 2003 Aug 22. PMID: 12937176

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