2XV2:
reference: Metal-Binding Loop Length Is a Determinant of the pK(a) of a Histidine Ligand at a Type 1 Copper Site., Li C, Sato K, Monari S, Salard I, Sola M, Banfield MJ, Dennison C, Inorg Chem. 2010 Dec 8. PMID: 21141901

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