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Processing of glycoproteins in APCs. (A) The intact glycoprotein has been taken up by the APC and is transported through the endocytic pathway. (B–D) The peptide fragments after alternate glycan processing. In all three, the peptide is in extended conformation. (B) The complex glycan group has survived the processing and is left intact on the peptide fragment. (C) Only some of the glycan has survived bound to the glycosylated segment. (D) The glycan has been removed entirely.
