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Reflectron negative-ion MALDI-MS of lipid A isolated from the M. catarrhalis 7169kdsA11 mutant. Results for all ions are represented as deprotonated (M-H)− exact masses. The upper right portion of the figure shows the structure of the major species at m/z 1781.95. Abbreviations: C12:0-OH, 3-hydroxy-dodecanoyl acyl chain; C12:0, dodecanoyl acyl chain; C10:0, decanoyl acyl chain. *, sodiated species.
