AvicGFPGyc-89Db.3.4 is found in a subset of the gustatory receptor neurons of labellum, of the anterior wing margin and in the three most distal segments of the prothoracic leg. In the labellum, three neurons co-express ScerGAL4Gyc-89Da.1.9. The labeled neurons of the anterior wing margin do not innervate the bristles.