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Reflectron MALDI-TOF mass spectra, recorded in negative polarity, of lipid A from E. pacifica KMM 6172T (a) and E. vietnamensis KMM 6221T (b) obtained after acetate buffer treatment of each LPS. The lipid A species are labelled as Tri- and Tetra-Lip A indicating the degree of acylation. “HexA” indicates the hexuronic acid (i.e., the d-GalA).
