Two direct repeats of the +2 element from the nos 3' untranslated region (UTR) have been inserted in the αTub84B 3' UTR sequences.
nanosnanos.+2-2X.Tag:HA partially rescues nanosBN
Embryos derived from nosBN females carrying nosnos.+2-2X.T:Ivir\HA1 develop 4-6 abdominal segments in 67% of cases and 7-8 abdominal segments in 31% of cases.