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Fig. 4. Identified classes of antennal sensilla based on physiological characteristics of olfactory receptor neurones (ORNs) present. Each sensillum type (S1—S8) is presented together with the response spectra of the respective ORNs (A, B, C and D) housed within each sensillum type. Beneath the sensillum type the number (N) encountered is indicated. Beneath the molecular configuration of each ligand type the maximum response is indicated (spikes s-1). NR, no response to any tested stimulus.