2W3S:
reference: Mechanism of substrate and inhibitor binding of Rhodobacter capsulatus xanthine dehydrogenase., Dietzel U, Kuper J, Doebbler JA, Schulte A, Truglio JJ, Leimkuhler S, Kisker C, J Biol Chem. 2008 Dec 24. PMID: 19109249

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