1SB9:
reference: Crystal structure of WbpP, a genuine UDP-N-acetylglucosamine 4-epimerase from Pseudomonas aeruginosa: substrate specificity in udp-hexose 4-epimerases., Ishiyama N, Creuzenet C, Lam JS, Berghuis AM, J Biol Chem 2004 May 21;279(21):22635-42. Epub 2004 Mar 10. PMID: 15016816

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