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Negative ion ESI-FT-MS of mutant LPS. The triply charged [M − 3H]3− molecular ion region for the LPS from lgtB− (A), lgtB− pagL+ (B), and galE− lpxL1− (C) mutants of N. meningitidis is shown. The insets contain simplified representations of the LPS structures assigned to base molecular ions (highlighted by asterisks). See Table 1 for detailed LPS composition proposals. All annotations refer to the triply charged monoisotopic m/z values.
