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(a) Negative ion mode MALDI FT ICR MS spectrum of k-CN glycopeptides after 24 hrs of reaction with immobilized pronase digestion. (b) Positive ion mode MS spectrum of k-CN glycopeptides from the same sample. Inverted triangles (
) represent potential glycopeptide peaks labeled based on the GP finder analysis of the spectrum mass list. Rectangles (
), circles (
) and diamond symbols (
) represent GalNAc, Gal and NeuAc residues, respectively.
