4NRS:
reference: Structural insights into the substrate specificity and transglycosylation activity of a fungal glycoside hydrolase family 5 beta-mannosidase., Zhou P, Liu Y, Yan Q, Chen Z, Qin Z, Jiang Z, Acta Crystallogr D Biol Crystallogr. 2014 Nov;70(Pt 11):2970-82. doi:, 10.1107/S1399004714019762. Epub 2014 Oct 23. PMID: 25372687

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