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(A) MALDI-TOF MS spectra of Bz and d-Bz labeled glycopeptides mixed in different molar ratios (1:0, 1:0.43, 1:0.71, 1:1, 1:1.29, 1:1.57, 1:1.86, 1:2.14, 0:1); (B) Enlarged spectra of IgG1 glycopeptides containing Hex3HexNAc4dHex1, Hex4HexNAc4dHex1, Hex3HexNAc5dHex1, Hex5HexNAc4dHex1, Hex4HexNAc5dHex1; (C) Calibration curves (peak intensity ratio vs. H/D molar ratio, H/D ratio means Bz-/d-Bz-labeled glycopeptides).
