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We previously reported on glycopeptide mapping of erythropoietin (EPO) by liquid chromatography/mass spectrometry (LC/MS). Using this method, glycopeptides in proteolytic digestion can be eluted before peptides, and are further separated on the basis of the carbohydrate structure. The detailed glycosylation at each glycosylation site can be elucidated based on mass chromatography and mass spectroscopy...
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