Figure 4

Identification of consensus peptide FAVETAITDVINAQR. The MS/MS spectrum of peptide FAVETAITDVINAQR which was specific to the splice variant of A. flavus UDP-glucose 4-epimerase [Entrez Gene: 7919639] resulted from a 2⁺ precursor ion at m/z 824.44 with a measured mass accuracy of 0.667 ppm. The MS spectrum showing a SILAC pair of ¹²C₆-Arg (m/z = 824.44) and ¹³C₆-Arg (m/z = 827.45) peptides with a 3 Da mass difference supported the identification, since an arginine appeared on the C terminus of the peptide sequence.