5NV9:
reference: Substrate-bound outward-open structure of a Na(+)-coupled sialic acid symporter reveals a new Na(+) site., Wahlgren WY, Dunevall E, North RA, Paz A, Scalise M, Bisignano P, Bengtsson-Palme J, Goyal P, Claesson E, Caing-Carlsson R, Andersson R, Beis K, Nilsson UJ, Farewell A, Pochini L, Indiveri C, Grabe M, Dobson RCJ, Abramson J, Ramaswamy S, Friemann R, Nat Commun. 2018 May 1;9(1):1753. doi: 10.1038/s41467-018-04045-7. PMID: 29717135

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