5N9Y:
reference: The structural basis of proton driven zinc transport by ZntB., Gati C, Stetsenko A, Slotboom DJ, Scheres SHW, Guskov A, Nat Commun. 2017 Nov 3;8(1):1313. doi: 10.1038/s41467-017-01483-7. PMID: 29101379

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