1ZI6:
reference: Following directed evolution with crystallography: structural changes observed in changing the substrate specificity of dienelactone hydrolase., Kim HK, Liu JW, Carr PD, Ollis DL, Acta Crystallogr D Biol Crystallogr. 2005 Jul;61(Pt 7):920-31. Epub 2005, Jun 24. PMID: 15983415

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