4M58:
reference: Planar substrate-binding site dictates the specificity of ECF-type nickel/cobalt transporters., Yu Y, Zhou M, Kirsch F, Xu C, Zhang L, Wang Y, Jiang Z, Wang N, Li J, Eitinger T, Yang M, Cell Res. 2014 Mar;24(3):267-77. doi: 10.1038/cr.2013.172. Epub 2013 Dec 24. PMID: 24366337

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