Involved cell autonomously in PLM neuron pre-synaptic differentiation by negatively regulating prk-2 expression and in neurite branch positioning. In PLM neurons, translocates into the nucleus during the 3-fold embryonic stage and remains nuclear in the adult. Nuclear localization is idb-1-dependent. Ubiquitously expressed with higher expression in the head and tail ganglia, the vulva and PLM neurons. Expression begins at the 1.5-fold embryonic stage and is retained in the adult. Defects in PLM neuron synaptic differentiation characterized by a misalignment of active zones and synaptic vesicles, branch point anterior to the vulva and overextension of synaptic branch. DD motoneurons display similar pre-synaptic defects. Increased expression of prk-2. In addition, mutants display a moderate uncoordinated movement, a small decrease in body size, a defect in egg laying and a slower growth.