5GOR:
reference: Structural Analysis of the Catalytic Mechanism and Substrate Specificity of Anabaena Alkaline Invertase InvA Reveals a Novel Glucosidase., Xie J, Cai K, Hu HX, Jiang YL, Yang F, Hu PF, Cao DD, Li WF, Chen Y, Zhou CZ, J Biol Chem. 2016 Dec 2;291(49):25667-25677. Epub 2016 Oct 24. PMID: 27777307

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