FIGURE 2.

Single sensillum responses of Drosophila melanogaster olfactory sensory neurons to coffee furanone. Concentration-response curves for coffee furanone in A, Olfactory sensory sensilla ab1 for wild type, CantonS (Cs) D. melanogaster, Or42b-/-, and Orco-/- flies (n = 10 each; C = solvent control). B–L, Listed olfactory sensilla types for Cs flies (n = 5 each for ab2-ab8, at1 and ac3; n = 4 each for ac2 and ac4). B–L, Responses for each sensillum are listed as total sensillum response (black), large (A; red) and/or small (B; blue) spiking neurons. Receptors expressed in each responding neuron type listed in Table 1. ^∗p value < 0.05 at first significant test concentration, paired t-test.