In contrast to wild-type flies, Df(3L)ΔGr64 mutant flies expressing Gr64f^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 do not show a behavioural preference for sucrose over fructose. In contrast to wild-type flies, the mutant flies display only a minimal increase in action potentials in response to sucrose.

Df(3L)ΔGr64 mutants expressing both Gr64f^Scer\UAS.cJa and Gr64a^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 show a behavioural preference for sucrose over fructose that is very similar to that of wild-type flies. The wild-type frequency of action potentials in response to sucrose is also restored in these animals.

In contrast to wild-type flies, Df(3L)ΔGr64 mutant flies expressing Gr64f^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 display only a minimal increase in action potentials in response to maltose and they do not show a behavioural preference for maltose over fructose.

Df(3L)ΔGr64 mutants expressing both Gr64f^Scer\UAS.cJa and Gr64a^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 show a behavioural preference for maltose over fructose that is very similar to that of wild-type flies. The wild-type frequency of action potentials in response to maltose is also restored in these animals.

Expression of Gr64f^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 partially restores the preference for glucose over fructose and action potentials in response to glucose in Df(3L)ΔGr64 mutants.

Co-expression of Gr64a^Scer\UAS.cJa and Gr64f^Scer\UAS.cJa under the control of Scer\GAL4^Gr5a.1 restores normal preference for glucose over fructose and wild-type frequencies of glucose dependent actin potentials.