Sequences encoding the sc helix-loop-helix (HLH) domain (not including the basic domain) have been replaced by sequences encoding the ato HLH domain, and the chimeric gene is expressed under the control of UAS regulatory sequences.
Does not produce ectopic chordotonal organs in the wing, when expressed using Scer\GAL4hs.PB. These flies do have ectopic external sensory organs in the wing.