Expression of robo210xScer\UAS.T:Ivir\HA1,T:SS-wg under the control of Scer\GAL4elav.PLu results in a biphasic phenotype in the embryonic central nervous system: some segments are almost commissureless, while others show ectopic crossing of the midline by Fas2-positive axons (more than 80% of segments).
Expression of robo210xScer\UAS.T:Ivir\HA1,T:SS-wg under the control of Scer\GAL4eg-Mz360 in embryos results in 57.8% of EW neurons failing to cross the midline.
Expression of robo210xScer\UAS.T:Ivir\HA1,T:SS-wg under the control of Scer\GAL4sli.PS in embryos results in ectopic crossing of the midline by Fas2-positive axons in almost 80% of segments. 20% of segments have fused commissures.
Expression of robo210xScer\UAS.T:Ivir\HA1,T:SS-wg under the control of Scer\GAL4eg-Mz360 in embryos results in the EW axons failing to cross the midline in just over half of segments.