4QLK:
reference: Effects of active site cleft residues on oligosaccharide binding, hydrolysis, and glycosynthase activities of rice BGlu1 and its mutants., Pengthaisong S, Ketudat Cairns JR, Protein Sci. 2014 Dec;23(12):1738-52. doi: 10.1002/pro.2556. Epub 2014 Oct 23. PMID: 25252199

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