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The ETD spectrum of the +4 charge state precursor ion at m/z 940.4, which corresponds to the glycopeptide AA 263–277 with an N-linked glycan Neu5Ac1Hex4HexNAc4Fuc1 at position 270 labeled with TMT. Most of the c ions and z · ions were detected, and the glycosylation site was clearly identified at position 270. The peptide sequence was identified with a series of c/z · ions
