1FES:
reference: Solution structure of the Cu(I) and apo forms of the yeast metallochaperone, Atx1., Arnesano F, Banci L, Bertini I, Huffman DL, O'Halloran TV, Biochemistry 2001 Feb 13;40(6):1528-39. PMID: 11327811

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).