3LU1:
reference: Altered architecture of substrate binding region defines the unique specificity of UDP-GalNAc 4-epimerases., Bhatt VS, Guo CY, Guan W, Zhao G, Yi W, Liu ZJ, Wang PG, Protein Sci. 2011 May;20(5):856-66. doi: 10.1002/pro.611. Epub 2011 Apr 5. PMID: 21384454

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