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MALDI-TOF MS profiles of the permethylated N-linked glycans from human (A), domestic pigs (B), GGTA1 knockout pigs (C) and GGTA1/CMAH knockout pigs in the ion range of 3100 to 4500 m/z. Major peaks are annotated with their proposed carbohydrate structures using the nomenclature proposed by the consortium for functional glycomics (18).
