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The complex and heterogeneous cell wall of the pathogenic bacterium Streptococcus pneumoniae is composed of peptidoglycan and a covalently attached wall teichoic acid. The net-like peptidoglycan is formed by glycan chains that are crosslinked by short peptides. We have developed a method to purify the glycan chains, and we show that they are longer than approximately 25 disaccharide units. From purified...
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