Figure 2

Coupled gas chromatography-electroantennography (GC-EAG) of Cimex lectularius (female, inset photo) responses to a bed bug-exposed paper volatile extract. Blue line corresponds to the flame ionisation detector (FID) on the GC. Black line corresponds to the antennal response of the insect preparation. Labelled peaks were GC-EAG-active in five or more of the 20 insects tested (peaks 1–21).