4EWN:
reference: A sugar isomerization reaction established on various (betaalpha)8-barrel scaffolds is based on substrate-assisted catalysis., Reisinger B, Bocola M, List F, Claren J, Rajendran C, Sterner R, Protein Eng Des Sel. 2012 Nov;25(11):751-60. doi: 10.1093/protein/gzs080. Epub, 2012 Oct 28. PMID: 23109729

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