... 1b.Solid information regarding the sequences of sugar unitswas obtained by FAB-MS of the methylated core OSderivative. Figure 2 and Table 3 shows a series of A-typeprimary glycosyl oxonium ions, and ... togenes recently identified in the Gram-positive, A. thermo-aerophilus, involved in the biosynthesis of D-glycero-D-manno-heptopyranose in the S-layer glycoprotein [46].Campylobacter species ... varying modifications (methylation,carbamoylation, acetylation, and fucosylation) [54]. Phos-phocholine functions are present on pilin proteins of pathogenic Neisseria and on LPS sugars of commensalNeisseria...