Acts with sax-2 to restrict the growth of both primary and secondary neurites. Regulates mechanosensory tiling by controlling the termination point of sensory dendrites. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Widely expressed in embryonic and larval neurons that contribute axons to the nerve ring and in hypodermal cells, including lateral seam cells. Also displays a punctate localization in muscle. Expanded cell bodies and ectopic neurites in many classes of neurons. Overlap of anterior lateral microtubule (ALM) and posterior lateral microtubule (PLM) neurites along the anteroposterior axis. Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family.