2A8Y:
reference: The crystal structure of 5'-deoxy-5'-methylthioadenosine phosphorylase II from Sulfolobus solfataricus, a thermophilic enzyme stabilized by intramolecular disulfide bonds., Zhang Y, Porcelli M, Cacciapuoti G, Ealick SE, J Mol Biol. 2006 Mar 17;357(1):252-62. Epub 2005 Dec 27. PMID: 16414070

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