4PTX:
reference: Biochemical and structural characterization of a thermostable beta-glucosidase from Halothermothrix orenii for galacto-oligosaccharide synthesis., Hassan N, Nguyen TH, Intanon M, Kori LD, Patel BK, Haltrich D, Divne C, Tan TC, Appl Microbiol Biotechnol. 2014 Aug 31. PMID: 25173693

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