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Mass spectrometry of trophoblast oligosaccharides. MS spectra of SPE fraction in the positive ion mode (panel a) and negative ion mode (panel b) are shown. In addition, MS2 spectra of m/z 527.4 (panel c) and m/z 685.5 (panel d) in the positive ion mode are given. The similarities in these fragmentation patterns in panels c and d suggest structural similarities in these two compounds.
