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Negative-mode ESI-MS results obtained with a QqTof system for LMW EPS fraction from strain A6 grown on sucrose. (A) MS spectrum of R. sullae LMW EPS fraction; (B) MS/MS spectrum of ion [M-H]− m/z 1,041.4; (C) MS/MS spectra of the observed structural variations—nude, acetylated, or succinylated.
