Fig. 2

Single sensillum recordings from neurons expressing Spodoptera littoralis SlitOR40 in Drosophila melanogaster antennae. Values correspond to spikes per second produced during odor stimulation. The odor panel consisted of 54 compounds, individually loaded in disposable Pasteur glass pipettes at a dose of 100 μg. Differences in the electrophysiological responses from the empty neuron flies to β-caryophyllene (10 μg) and α-humulene (10 μg) were tested using the Student t-test. None of the remaining compounds in the panel responded significantly. The compounds are listed in decreasing order of signal strength. Error bars indicate standard deviations. The analyses were based on recordings from six flies; P = 0.76. NS not significant