5YS5:
reference: Crystal structures of multicopper oxidase CueO G304K mutant: structural basis of the increased laccase activity., Wang H, Liu X, Zhao J, Yue Q, Yan Y, Gao Z, Dong Y, Zhang Z, Fan Y, Tian J, Wu N, Gong Y, Sci Rep. 2018 Sep 24;8(1):14252. doi: 10.1038/s41598-018-32446-7. PMID: 30250139

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