FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
Mutant embryos show varying degrees of defective axonal tracts in the ventral nerve cord, including premature truncation and abnormal midline crossing of longitudinal tracts.
Mutant third instar larvae contain clusters of synaptic vesicles within the axon shaft of the segmental nerve. Less than 5% of labelled vesicles are mobile in the mutant larvae and the average speed of transport is 0.05 +/- 0.01 μm/sec (compared to an average speed of 0.89 +/- 0.06 μm/sec in wild-type larvae).
Mutant larvae show sluggish crawling and occasional tail flipping.