4LZ6:
reference: Structural insights into H(+)-coupled multidrug extrusion by a MATE transporter., Lu M, Radchenko M, Symersky J, Nie R, Guo Y, Nat Struct Mol Biol. 2013 Nov;20(11):1310-7. doi: 10.1038/nsmb.2687. Epub 2013, Oct 20. PMID: 24141706

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