3ZK8:
reference: Imperfect coordination chemistry facilitates metal ion release in the Psa permease., Counago RM, Ween MP, Begg SL, Bajaj M, Zuegg J, O'Mara ML, Cooper MA, McEwan AG, Paton JC, Kobe B, McDevitt CA, Nat Chem Biol. 2013 Nov 10. doi: 10.1038/nchembio.1382. PMID: 24212134

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