3GYI:
reference: A hydrogen-bonding network is important for oxidation and isomerization in the reaction catalyzed by cholesterol oxidase., Lyubimov AY, Chen L, Sampson NS, Vrielink A, Acta Crystallogr D Biol Crystallogr. 2009 Nov;65(Pt 11):1222-31. Epub 2009, Oct 22. PMID: 19923719

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