Involved in several processes, including neurogenesis; regulation of photoreceptor cell axon guidance; and salivary gland boundary specification. Located in axonal growth cone; neuronal cell body; and perinuclear region of cytoplasm. Is expressed in several structures, including ISN innervated muscle cell of A1-7; embryonic cardioblast; imaginal disc primordium; optic lobe intrinsic columnar neurons; and somatic precursor cell. Human ortholog(s) of this gene implicated in congenital mirror movement disorder. Orthologous to human NTN1 (netrin 1).