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LPS extracts from wild type Schu S4 (A), CipR (B), kdsD::ltrBL1, (C) and complemented kdsD mutant were analyzed by negative ion mode MALDI-TOF mass spectrometry. Monoisotopic mass/charge values of the four most prominent species within each spectrum are reported; these values correspond with the expected molecular weights of F. tularensis lipid A and its known variants as previously reported [29].
