3RU5:
reference: Silver metallation of hen egg white lysozyme: X-ray crystal structure and NMR studies., Panzner MJ, Bilinovich SM, Youngs WJ, Leeper TC, Chem Commun (Camb). 2011 Dec 14;47(46):12479-81. Epub 2011 Oct 31. PMID: 22042312

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