DNA binding protein that function as transcriptional activator (By similarity). May play a role in the determination and function of cell types in the brain. Embryonic brain; accumulates in approximately 30 cells in each brain hemisphere. One of these cells is closely associated with the terminus of the larval visual nerve (Bolwig's nerve). Expressed during embryogenesis with very low levels found in the larva and adult. Belongs to the distal-less homeobox family.