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Representative chromatograms of peptides and glycopeptides: (a) MRM chromatogram of the four IgG subclass peptides, (b) MRM chromatogram of glycopeptides in each of the four subclasses, and (c) MRM chromatogram of glycosylated and deglycosylated IgG1 and IgG2 peptides with asparagine and aspartic acid residues.
