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https://www.ncbi.nlm.nih.gov/Structure/pdb/5FFD
5FFD: CopM in the Ag-bound form (by co-crystallization)
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https://www.ncbi.nlm.nih.gov/Structure/pdb/2Y3B
2Y3B: Co-bound form of Cupriavidus metallidurans CH34 CnrXs
NICKEL AND COBALT RESISTANCE PROTEIN CNRRCOBALT (II) IONGLYCEROL
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