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Identification of CRC marker glycopeptides. The mass spectrum of the CRC marker was incorporated into a database that included the m/z and retention times of glycopeptides generated from standard serum proteins by trypsin digestion. (a) mass spectrum of standard LRG glycopeptides (upper), and mass spectrum of target marker glycopeptides detected in CRC patients (lower), and (b) the proposed structure of the CRC marker
