6ZLL:
reference: Crystallographic snapshots of UDP-glucuronic acid 4-epimeraseligand binding, rotation and reduction., Iacovino LG, Savino S, Borg AJE, Binda C, Nidetzky B, Mattevi A, J Biol Chem. 2020 Jul 13. pii: RA120.014692. doi: 10.1074/jbc.RA120.014692. PMID: 32661196

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