4QIQ: Crystal Structure Of D-Xylose-Proton Symporter
reference: Proton-coupled sugar transport in the prototypical major facilitator superfamily protein XylE., Wisedchaisri G, Park MS, Iadanza MG, Zheng H, Gonen T, Nat Commun. 2014 Aug 4;5:4521. doi: 10.1038/ncomms5521. PMID: 25088546

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