Together with unc-5, involved in touch neuron axon guidance (PubMed:9473333). During gonad morphogenesis, plays a role in the unc-5-/unc-6-mediated migration of distal tip cells along the body (PubMed:17716643). Highly expressed in intestinal cells, lateral hypodermal (seam) cells, Pn.p ventral hypodermal cells, and spermatheca (PubMed:17716643). Expressed at low levels in the ventral nerve cord (PubMed:17716643). Expressed in all nuclei in the early embryo until the comma stage, and then is expressed in body wall muscle cells and pharynx in the embryo (PubMed:17716643). Expressed in muscle until the late larval stages (PubMed:17716643). In larvae, highly expressed in intestinal cells, lateral hypodermal (seam) cells, Pn.p ventral hypodermal cells, and spermatheca (PubMed:17716643). In L3 stage larvae, expressed at low levels in distal tip cells during the ventral-to-dorsal second and longitudinal third migration phases, but not expressed during the first migration phase (PubMed:17716643). In L4 stage larvae, expressed at low levels in the ventral nerve cord (PubMed:17716643).