3WKF:
reference: Structural insights into the epimerization of beta-1,4-linked oligosaccharides catalyzed by cellobiose 2-epimerase, the sole enzyme epimerizing non-anomeric hydroxyl groups of unmodified sugars., Fujiwara T, Saburi W, Matsui H, Mori H, Yao M, J Biol Chem. 2013 Dec 20. PMID: 24362032

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