Fig. 2From: Quantitation of glutathione S-transferases in rice (Oryza sativa L.) roots exposed to cadmium by liquid chromatography–tandem mass spectrometry using isotope-labeled wing peptides as an internal standardThe LC–MS/MS chromatograms (a, b) and linear responses (c, d) of the signature peptides VFGSPTSAEVAR, TPLLAAWAER and their corresponding isotope-labeled signature peptides VFGSPTSAEV*AR, TPLLAAWAER*Back to article page