VD/DD axon guidance defects. (A, B) Micrographs of young adult animals with unc-25::gfp expression in the VD/DD motor axons. In wild type, the commissural axons generally extend directly from ventral to dorsal. In arx-7(ok1118M+), axons often wandered laterally and crossed other commissures before reaching the dorsal cord (arrow). (C) Percentage of animals with misguided VD/DD commissural axons.