Construct: The 535bp of the osk 3' UTR present in oskbcd.3UTR.A7 have been replaced with a 357bp region of the osk 3' UTR that does not contain any aret response elements (BREs).
Embryos derived from females carrying oskbcd.3UTR.A6 have a similar phenotype to embryos derived from females carrying oskbcd.3UTR.A7. The oskbcd.3UTR.A6 phenotype is not enhanced if the mother is also heterozygous for an aret- mutation.