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. 2011 Mar 4;286(25):22510–22520. doi: 10.1074/jbc.M110.217315

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© 2011 by The American Society for Biochemistry and Molecular Biology, Inc.

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FIGURE 4. — ESI-MS of the tetrasaccharides in fraction 1. The tetrasaccharides in fraction 1, which contains the most abundant products, were analyzed by ESI-MSⁿ. A shows the fragmentation of the m/z 725 ion, which includes the tetrasaccharides. B shows the fragmentation of the m/z 551 ion derived from the m/z 725 ion in A. C and D depict the fragmentation pattern of the m/z 391 and m/z 377 ions, respectively, derived from the m/z 551 ion generated in B. The masses of y ions are indicated unless otherwise stated.