Figure 7

LC-MS/MS tandem mass spectrum of deamindated peptide sequences obtained by enzymatic digestion. A. the MS/MS spectrum of the deamindated peptide ¹²ATN_deamGTDFQLPPLISSR²⁷; B. the MS/MS spectrum of the deamindated peptide ³⁹DPDAEAYYIN_deamK⁴⁹; C. the MS/MS spectrum of the deamindated peptide ⁵⁰SVQWYQAHGGN_deamYTALINQ⁶⁷. Red residues in three peptides represent the N-glycosylation sites. The peptide sequence and the b and y type of fragments were indicated.