activity is required for the perdurance of EAG responses. For each fly strain, a 10-4 dilution of ethyl acetate was used to evoke EAG responses. The EAG fall time constant in Gal80ts20/+; UAS-PTX/+ and Or83b-Gal4/+ control strains is not different (p > 0.8) at 18°C and 32°C. Gal80ts20/Or83b-Gal4; UAS-PTX/+ flies have a significantly (p < 0.01) longer EAG fall time constant in the absence of PTX expression (18°C) than in the presence of PTX expression (32°C). For each genotype and temperature, at least 8 EAG recordings from minimum 4 flies were analyzed. Asterisks denote a significant (p < 0.05) change. All values are mean ± S.E.M.