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MALDI-TOF MS positive mode spectra of the HF-PS (A) and de-O-acetylated HF-PS (B) from B. cereus ATCC 10987. The proposed compositions for the various ions are given in Table 2. The spectrum shown in A was obtained in the reflectron mode, whereas the spectrum shown in B was obtained in the linear mode. R2, two (HexNAc)3(Hex)1 repeat units; R3, three repeat units, etc.
