A 7833bp fragment from immediately upstream of the Ir75a start codon is fused upstream of GAL4 and a 1921bp fragment from immediately downstream of the Ir75a coding sequence is fused downstream of GAL4.
ScerGAL4Ir75a.PS is expressed in the olfactory receptor neuron Ir75a that innervates the antennal coeloconic sensillum ac2 and projects to the the antennal lobe glomerulus DP1l.