The electrical response to 100mM sucrose in sugar-sensitive GRNs in Ac78C^Δ32is significantly lower than that in controls, during the period between 200ms and 1.6s after the onset of stimulus. The response in Ac78C^Δ32 mutants is approximately 60% of those in controls at 100mM sucrose. The response at 4, 20, and 100mM sucrose in Ac78C^Δ32 mutants is significantly lower than in controls. Moreover, the extent of depression in Ac78C^Δ32 is greater at lower, concentrations, and the response to 400mM sucrose is not different between Ac78C^Δ32 and controls. The water response is not affected in this mutant.

Responses to 8, 40, 200, and 80mM trehalose in Ac78C^Δ32 flies are significantly lower than those in controls, while the amount of water intake is no different to that in controls. Ac78C^Δ32 hemizygotes show impaired sucrose response.

The avoidance index to denatonium benzoate or quinine is not affected in Ac78C^Δ32 flies, but the response to 1mM caffeine is significantly lower than in controls.