2PS3:
reference: Structure and metal binding properties of ZnuA, a periplasmic zinc transporter from Escherichia coli., Yatsunyk LA, Easton JA, Kim LR, Sugarbaker SA, Bennett B, Breece RM, Vorontsov II, Tierney DL, Crowder MW, Rosenzweig AC, J Biol Inorg Chem. 2008 Feb;13(2):271-88. Epub 2007 Nov 20. PMID: 18027003

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