FRT-mediated recombination between the two progenitor insertions has deleted the genomic sequence between them, removing the mRpL12 and CG13313 gene and almost all of CG5660.

Adult DL1 projection neuron homozygous single-cell clones target their dendrites correctly to the DL1 glomerulus and show considerable dendritic elaboration. However, the dendritic density in the glomerulus is reduced compared to wild type in 2-5 day old adults. In 30 day old adults, mutant DL1 projection neuron dendrites no longer occupy the centre of the DL1 glomerulus and instead some dendrites surround the glomerulus while others are outside of the antennal lobes. Axonal growth, guidance and terminal branching appears largely normal in anterodorsal projection neuron homozygous single-cell clones.