Neuropeptide localization in unfed and fed C. sapidus PO. (i.) Optical image of a PO tissue on a MALDI plate before being coated with DHB matrix. (ii. – xxi.) MALDI-MS images of several neuropeptides of interest from seven families: four RYamides, four AST-B peptides, one CCAP, two AST-A peptides, four RFamides, four orcokinins, and one tachykinin. The orientation of all the figures are the same