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MALDI-TOF spectra of lipid A purified from strains HT1222 (ΔlptA::spc) (A) and HT1125 (wild type) (B). The masses of the abundant fragments are indicated at the tops of the corresponding peaks. The ions of molecules containing a PEA group in HT1125 lipid A (m/z = 1838, 1758, and 1575) (Table 3) are not detected in those of HT1222 lipid A.
