A 3.9kb Gr92a promoter fragment is fused upstream of sequence encoding a GAL4 driver.
ScerGAL4Gr92a.3.9 is expressed in gustatory neurons of 4 of the bitter-sensitive short labellar taste bristles.
ScerGAL4Gr92a.3.9 is expressed in a few of the short bitter-sensitive sensilla of the labellum.