1POY:
reference: Crystal structure of PotD, the primary receptor of the polyamine transport system in Escherichia coli., Sugiyama S, Vassylyev DG, Matsushima M, Kashiwagi K, Igarashi K, Morikawa K, J Biol Chem 1996 Apr 19;271(16):9519-25. PMID: 8621624

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