2EF7:
reference: Crystal structure of ST2348, a CBS domain protein, from hyperthermophilic archaeon Sulfolobus tokodaii., Ragunathan P, Kumarevel T, Agari Y, Shinkai A, Kuramitsu S, Yokoyama S, Ponnuraj K, Biochem Biophys Res Commun. 2008 Oct 10;375(1):124-8. Epub 2008 Aug 6. PMID: 18691556

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