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Table of ETD and CID fragment ions
The observed masses of the MS3 fragment ions for each Endo-F2-digested glycopeptide and the MS2 fragments from the corresponding unmodified peptides were compared to the theoretical masses. The mass added to the modified residue corresponds to a HexNAc monosaccharide, which is maintained at the site of modification after the loss of the core-linked fucose in the MS2 scan event.
