Figure 3. Odor responses of Aedes aegypti receptors in the CO₂ empty neuron are modulated by Gr copy number.

(A) Mean ab1C responses to 2.5% CO₂ for different Gr combinations (n = 6–12). (B) Representative traces of ab1 sensilla expressing mosquito receptors in the CO₂ empty neuron with responses to pyridine. Dots mark action potentials attributed to the ab1C neuron during part of the baseline and the 0.5 s stimulus window. (C) Mean odorant responses normalized to the total sensillar response in the CO₂ empty neuron. Error bars are s.e.m. (n = 6–8; ANOVA followed by Dunnett’s test comparing results to Gr2+Gr3, **p < 0.01, ***p < 0.001). (B,C) Pyridine was diluted at 1% (v/v) in paraffin oil. The copy number of each transgene is indicated; all used a single copy of the Gr63a–GAL4 driver (see Table S1). Stimulus = 0.5 s. See also Figure S3.