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CID MS/MS of pEtN-glycan-modified glycopeptide 27ESNASVELK35. A, a fragmentation map shows complete coverage of the pEtN-glycan. B, shown is fragmentation of the doubly-charged ion of 27ESNASVELK35 (m/z = 1253.03597). Highlighted regions of both 1120–1240 m/z (I) and 450–1100 m/z (II) are provided to enable complete glycan annotation.
