1IX2:
reference: Crystal structure and dimerization equilibria of PcoC, a methionine-rich copper resistance protein from Escherichia coli., Wernimont AK, Huffman DL, Finney LA, Demeler B, O'Halloran TV, Rosenzweig AC, J Biol Inorg Chem 2003 Jan;8(1-2):185-94. PMID: 12459914

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