UASp regulatory sequences are fused upstream of three segments of osk DNA: a genomic BamHI-EcoRI fragment (starting just upstream of the transcription unit and containing the first eight codons), a cDNA EcoRI-MluI fragment (containing most of the coding region) and a genomic fragment from the MluI site to a synthetic BamHI site introduced just after the stop codon (containing the C-terminal part of the coding region and the final, small intron).
Expression of oskScer\UAS.P\T.cRa driven by Scer\GAL4mat.αTub67C.T:Hsim\VP16 results in the disruption of normal anterior embryonic body patterning resulting in a very high frequency of bicaudal embryos.
92% of embryos derived from females expressing oskScer\UAS.P\T.cSa under the control of Scer\GAL4mat.αTub67C.T:Hsim\VP16 are bicaudal (having a mirror image duplication of posterior segments).
The bicaudal phenotype of embryos derived from females expressing oskScer\UAS.P\T.cSa under the control of Scer\GAL4mat.αTub67C.T:Hsim\VP16 is not altered by co-expression of aretScer\UAS.P\T.cSa.