5Z6V:
reference: Crystal structure of a substrate-binding protein from Rhodothermus marinus reveals a single alpha/beta-domain., Bae JE, Kim IJ, Kim KJ, Nam KH, Biochem Biophys Res Commun. 2018 Feb 26;497(1):368-373. doi:, 10.1016/j.bbrc.2018.02.086. Epub 2018 Feb 9. PMID: 29432740

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