The structure of a glycan from the surface-layer glycoprotein of Bacillus stearothermophilus strain NRS 2004/3a has been studied by 1H- and 13C-n.m.r. spectroscopy. The results indicate the glycan to be a polymer of the trisaccharide repeating-unit ----2)-alpha-L-Rhap-(1----2)-alpha-L-Rhap-(1----3)-beta-L-++ +Rhap-(1----.
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