2FQE:
reference: Crystal structures of E. coli laccase CueO at different copper concentrations., Li X, Wei Z, Zhang M, Peng X, Yu G, Teng M, Gong W, Biochem Biophys Res Commun. 2007 Mar 2;354(1):21-26. Epub 2006 Dec 22. PMID: 17217912

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