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(A) MALDI-TOF MS spectra of (i) Bz-labeled hIgG glycopeptides reacted with endoS (ii) equimolar mixture of Bz-labeled hIgG glycopeptides reacted with endoS and d-Bz-labeled hIgG glycopeptides not reacted with endoS (iii) equimolar mixture of Bz-labeled hIgG glycopeptides and d-Bz-labeled hIgG glycopeptides (iv) d-Bz-labeled hIgG glycopeptides; (B) Enlarged spectra from m/z 2400 to 3400; (C) Enlarged spectra of IgG1 glycopeptides containing Hex4HexNAc5dHex1.
