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Identification of the glycopeptides with HexNAc-(Fuc)Gal-GlcNAc epitope at Asn-420. A, base peak chromatogram of Lys-C-digested sEGFR peptide map; B, mass and charge of the Lys-C-digested peptide with the anticipated glycan structure; C, CID-MS2 spectrum of the precursor ion from B, and D, CID-MS3 spectrum of the precursor ion from Fig. 8C. The glycan symbols are the same as Fig. 2, except the gray square represents N-acetylhexosamine or HexNAc.
