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ES-MS and GLC-MS profiles of the alditol acetate derivatives of the core OS of C. jejuni galT. (A) ES-MS analysis of the galT core OS yielded a molecular ion (M-H) at m/z 1050.4 corresponding to an OS composed of two ld-Hep units, two Glc units, one Kdo residue, and one PEA moiety. The higher m/z ions represent Na adducts. (B) GLC-MS analysis showing the presence of Glc and ld-Hep (1,6-anhydro-ld-Hep emanates from ld-Hep during acidic hydrolysis).
