Required in the M3 pharyngeal motor neuron to guide the growth cone of the sister M2 motor neuron during axon development. In larva and adult, expressed in the M3 pharyngeal motor neurons, extrapharyngeal neurons in the head, the PQR tail neurons, rectal cells, vulva cells, the spermetheca-uterine valve, body wall muscle cells and neurons of the ventral nerve cord. In the embryo, expressed in pharyngeal cells, extrapharyngeal head neurons and within the tail. Expressed in body wall muscle cells during late embryonic stages. Expressed in the mother cells of the M2 and M3 pharyngeal motor neurons precursor cells at the embryonic bean stage and subsequently in the M2 and M3 cells as they are born. Expression is sustained only in the two M3 cells up to at least the 5-day-old adult. In contrast, expression gradually declines in the M2 cells beginning from the time of their birth, and is completely undetectable by the time of hatching. RNAi-mediated knockdown results in defective formation of the distal end of the two M2 pharyngeal motor neurons.