Gr93a³ mutant flies do not show significant changes in the expected avoidance response to food laced with acetic acid (5%), as compared to controls.

Gr93a³ mutant adults display impaired avoidance of umbelliferone in a two-way choice feeding assay compared to wild-type as well as reduced frequency of action potentials invoked upon exposure to umbelliferone (measured on S3, S5, S6 and S9 sensillae).

Gr93a³ mutant females display impaired umbelliferone avoidance in an assay testing site selection for egg laying but show normal aversion to lobeline as well as quinine.

Gr93a³ mutant larvae, like the wild-type, show preference for sucrose containing media over agarose-only in a binary choice larval behavior assay but unlike the wild-type keep preferring the sucrose media even if contaminated with umbelliferone.

Mutant flies show normal L-canavanine avoidance in a two-way choice test.

Gr93a³ flies show a similar preference for sugars (maltose, trehalose, fructose, glucose or sucrose) as wild-type controls in a binary food-choice assay between 1% agarose plus 10mM sugar and 1% agarose only.

Gr93a³ flies avoid quinine, strychnine, berberine, denatonium, lobeline and papaverine to the same extent as wild-type in a binary food-choice assay between 1mM sucrose alone and 5mM sucrose plus aversive compound. Action potentials induced in the gustatory receptor neurons in response to these aversive compounds are similar in Gr93a³ and wild-type animals.

Gr93a³ flies show reduced avoidance to caffeine in a binary food-choice assay. Caffeine-induced action potentials are virtually eliminated in the gustatory receptor neurons in Gr93a³ animals.

Mutant flies show reduced avoidance to theophylline in a binary food-choice assay, although avoidance responses to theobromine and paraxanthine are normal. Theophylline-induced action potentials are virtually eliminated in the gustatory receptor neurons in the mutant animals, although theobromine- or paraxanthine-induced action potentials are normal.