Approximately 3kb fragment from the oa2 region is fused upstream of a Drosophila synthetic core promoter (DSCP) that is followed by sequence encoding a GAL4 driver.
ScerGAL4oa2.R20E11 drives faint expression in motor neurons that form type Ib terminal buttons at the neuromuscular junction. Expression of ScerGAL4oa2.R20E11 is also broadly detected in the brain and ventral nerve cord.