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Negative-ion vMALDI-LIT mass spectra of the OS prompt fragment, from wild-type O-LPS, at m/z 1556. MALDI-MSn analyses of the parent ion at m/z 1556 generated a number of fragment ions (A). Further fragmentation of these products at m/z 1382 (B) and 892 (C) was performed. Masses labeled with an asterisk designate major masses minus water or CO2.
