3QE7:
reference: Structure and mechanism of the uracil transporter UraA., Lu F, Li S, Jiang Y, Jiang J, Fan H, Lu G, Deng D, Dang S, Zhang X, Wang J, Yan N, Nature. 2011 Apr 14;472(7342):243-6. Epub 2011 Mar 20. PMID: 21423164

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