ceh-12 is ectopically expressed in posterior VAs in
unc-4 mutants and is specifically required for the mis-wiring of VAs in this region.
ceh-12::GFP expression in posterior VAs is significantly reduced in
egl-20; unc- 4 double mutants. EGL-20 is exclusively required for ectopic
ceh-12 expression in posterior VA motor neurons.