UASt regulatory sequences drive expression of tal sequences in which all 4 type-A ORFs have been deleted, leaving the ATG for the one type-B ORF left, forcing its translation.
talATG-B.UAS/Scer\GAL4unspecified fails to rescue talunspecified
Expression of priATG-B.Scer\UAS under the control of Scer\GAL4unspecified fails to rescue the priunspecified phenotypes in the adult and the embryo.