The six remaining comm lysine residues in commΔ245-370.UAS.Tag:MYC have been mutated to arginine and the Tag:MYC tag has been replaced with Tag:HA.
Expression of commKR.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4ap-md544 causes the ipsilateral ap neurons to ectopically cross the midline.
Expression of commKR.Scer\UAS.T:Ivir\HA1 in the poxn neurons under the control of Scer\GAL4Poxn.14 rescues the midline crossing defects seen in comm072 homozygous stage 16 embryos.