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 (By similarity). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family.