5I6C:
reference: Structure of eukaryotic purine/H(+) symporter UapA suggests a role for homodimerization in transport activity., Alguel Y, Amillis S, Leung J, Lambrinidis G, Capaldi S, Scull NJ, Craven G, Iwata S, Armstrong A, Mikros E, Diallinas G, Cameron AD, Byrne B, Nat Commun. 2016 Apr 18;7:11336. doi: 10.1038/ncomms11336. PMID: 27088252

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