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Sections of three MALDI-TOF mass spectra of the F. tularensis strain 1547-57 lipid A sample, acquired in reflectron mode. (A) The negative-ion MALDI-TOF MS. (B) The positive-ion MALDI-TOF MS. (C) The positive-ion MALDI-TOF MS of the lipid A sample after HF treatment for 40 h.
