UAS regulatory sequences drive expression of full length robo1 with a signal sequence (Tag:SS(wg)) followed by three Tag:HA tags at the N-terminal end and the Tag:V5 epitope and Tag:polyHis tag at the C-terminal end.
When roboScer\UAS.T:SV5\V5,T:Zzzz\His6,T:Ivir\HA1,T:SS-wg and commScer\UAS.T:Hsap\MYC are co-expressed under the control of Scer\GAL4insc-Mz1407 the axons collapse into the midline.
Expression of roboScer\UAS.T:SV5\V5,T:Zzzz\His6,T:Ivir\HA1,T:SS-wg under the control of Scer\GAL4insc-Mz1407 almost completely rescues the ectopic commissural crossing phenotype seen in homozygous robo1 mutant embryos.