Imprecise excision of the insertion in Dscam05518, resulting in a deletion of sequences in the Dscam exon 4 cluster (exons 4.1 to 4.3 are lost).
Mushroom body morphology of these mutants is indistinguishable from wild type.
The axonal branching patterns of mutant posterior scutellar neurons are indistinguishable from controls.
Dendrites of class I da neurons do not show defects in self-avoidance in DscamC26-4 larvae.
Single cell clones of mushroom body α/β neurons that are homozygous for DscamC26-4 acquire two primary axonal branches that divergently extend away from each other, as occurs in wild-type single cell α/β neuron clones.