the polysaccharide nature of o-antigen thus obtained , the absence of lipid a and kdo and the low content of hexoses , or core-specific saccharides of s. sonnei lps , in this antigen make it possible to classify this material with o-components of microbial cells , described by different authors as `` '' native protoplasmic polysaccharide '' '' or `` '' l-hapten '' '' and formed by polymers of lps o-side chains .
C0023767
lipid a
C0023810
of