Figure 3From: Optimization of iTRAQ labelling coupled to OFFGEL fractionation as a proteomic workflow to the analysis of microsomal proteins of Medicago truncatula roots Spectrum of an iTRAQ labelled peptide of control (114) and mycorrhized (117) protein digest. (A) MS/MS spectrum of iTRAQ labelled CALVYGQMNEPPGAR at m/z 1806.94. (B) iTRAQ reporter ions at m/z 114 and 117, their peak areas are used to calculate the relative abundance of a given peptide.Back to article page