3TOP:
reference: Structural insight into substrate specificity of human intestinal maltase-glucoamylase., Ren L, Qin X, Cao X, Wang L, Bai F, Bai G, Shen Y, Protein Cell. 2011 Oct;2(10):827-36. Epub 2011 Nov 6. PMID: 22058037

This OCA Structure page
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