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Fragment patterns of MALDI-TOF/TOF MS spectra of OSEs in GPLs derived from M. intracellulare serotype 7, serotype 12, and serotype 7 transformants. The MALDI-TOF/TOF MS spectra were acquired using 10 mg/ml 2,5-dihydroxybenzoic acid in ethanol-water (3:7 [vol/vol]) as the matrix; the molecularly related ions were detected as [M + Na]+ in lift-lift mode. The assigned fragment patterns of glycosyl residues are depicted. a.u., absorbance units.
