LC-MS of SCAmpPs cyclic peptides. (a). HPLC-MS chromatogram of synthetic peptide GVPWAIAA. Upper trace is total ion current. Lower traced is the extracted ion current profile for the molecular ion (MH+) of cyclic GVPWAIAA. (b). HPLC-MS chromatogram of the fractionated phloem extract. Upper trace is total ion current (TIC). Lower trace is ion current profile for 766.32-766.52 m/z consistent with the molecular ion (MH+) of GVPWAIAA. Peak at 38.4 minutes is consistent with retention time of synthetic cyclic peptide GVPWAIAA.