1QL7:
reference: pH-dependent binding modes observed in trypsin crystals: lessons for structure-based drug design., Stubbs MT, Reyda S, Dullweber F, Moller M, Klebe G, Dorsch D, Mederski WW, Wurziger H, Chembiochem. 2002 Mar 1;3(2-3):246-9. PMID: 11921406

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