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Electrophoresis-assisted open-tubular liquid chromatography-mass spectrometry analysis of intact LOSs from C. jejuni wild-type 01/51 (A) and C. jejuni 01/51 Δcj1136 (B). The MS analysis of LOS samples purified from the C. jejuni 01/51 wild-type strain showed major peaks at m/z 1108 and 1478 of quadruply and triply charged ions, respectively, whereas triply charged species were observed at m/z 1151 in LOS isolated from the cj1136 mutant.
