Required for maintaining axon position of PVQ and PVP neurons postembryonically in the ventral nerve cord (VNC) by preventing axons drifting into the opposite side of the VNC that could occur during body growth and movement. Expressed in PVT, AIM and ASI neurons, in vulva and weakly in body wall muscles. Expression begins at the late L1 larval stage. At the L1 larval stage, display defects in the positioning of the ventral nerve cord (VNC) axons characterized by axons of PVQ and PVP neurons, but not of RMEV, HSN and AVK neurons, drifting into the opposite VNC side (axon flip-over) (PubMed:19737747). These defects are not enhanced in a zig-4 (gk34) mutant background or in zig-4 (gk34) dig-1 (ky188), zig-4 (gk34) sax-7 (nj48) or zig-4 (gk34) egl-15 (n484) mutant background (PubMed:19737747). In a zig-1, zig-2, zig-4 or zig-5 or zig-8 mutant background, cell body positioning of ASI and ASH head neurons is normal (PubMed:22829780).