Fig. 5From: 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 standardComparison of responses of the signature peptides VFGSPTSAEVAR (a) and TPLLAAWAER (b) dissolved in neat solution to responses of the signature peptides spiked into sample extractBack to article page