2KM0:
reference: CopK from Cupriavidus metallidurans CH34 Binds Cu(I) in a Tetrathioether Site: Characterization by X-ray Absorption and NMR Spectroscopy., Sarret G, Favier A, Coves J, Hazemann JL, Mergeay M, Bersch B, J Am Chem Soc. 2010 Mar 1. PMID: 20192263

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