3AUF:
reference: Structures and reaction mechanisms of the two related enzymes, PurN and PurU., Sampei G, Kanagawa M, Baba S, Shimasaki T, Taka H, Mitsui S, Fujiwara S, Yanagida Y, Kusano M, Suzuki S, Terao K, Kawai H, Fukai Y, Nakagawa N, Ebihara A, Kuramitsu S, Yokoyama S, Kawai G, J Biochem. 2013 Dec;154(6):569-79. doi: 10.1093/jb/mvt090. Epub 2013 Oct 9. PMID: 24108189

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