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An illustration using the mobilogram from Fig. 5B of our use of gas-phase separation with IMS-MS/MS to analyze A-, B-, and Y-type lipid A fragment ions of LOS formed in MALDI-TOF MS by in-source decay. A suite of molecules with different phosphoforms were detected that are represented on the lipid A structure using colored font to match reducing with nonreducing terminal phosphoryl substituents.
