Figure 4From: Metabolic labeling of plant cell cultures with K15NO3 as a tool for quantitative analysis of proteins and metabolitesMass spectra of unlabeled and labeled peptides of from glyceraldehyde-3-phosphate dehydrogenase C subunit (At3g04120) in a 1:1 mixture of unlabeled and labeled protein extracts. For each peptide the mass difference between unlabeled and labeled form of the peptide is different as indicated by the arrows.Back to article page