When Cdc42V12.Scer\UAS.T:Avic\GFP is over-expressed driven by Scer\GAL4eve.RN2, the anterior corner cell neuron (aCC) displays aberrant migration of the cell body, thickening of the axon, and premature termination of its axonal growth cone before reaching the target muscle. These phenotypes are qualitatively different from the loss-of-function phenotypes, and vary from segment to segment within a given embryo.