5XS8:
reference: Alternative substrate-bound conformation of bacterial solute-binding protein involved in the import of mammalian host glycosaminoglycans., Oiki S, Kamochi R, Mikami B, Murata K, Hashimoto W, Sci Rep. 2017 Dec 5;7(1):17005. doi: 10.1038/s41598-017-16801-8. PMID: 29208901

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