Expression is found in eye , wing , leg and haltere imaginal discs of the third instar larvae.
In the eye disc, transcripts are present in all cells but are more abundant in cells of the dorsal and ventral margins. In the wing disc, furrowed is expressed more abundantly in the cells of the prospective dorsal and ventral wing surfaces, the ventral pleura and the notum. It is expressed in the antennal , the labial, the clypeo-labral, the humeral and the genital discs. The gene is not expressed in other larval tissue such as the salivary glands, fat bodies, the Malpighian tubules, or the cuticle. Effects of mutation or deletion Mutations in furrowed result in pleiotropic defects in eye development, with deep furrows or folds in the regina of the adult compound eyes.