UASt regulatory sequences drive expression of an inverted repeat.
Depending on the insertion line used, expression under the control of Scer\GAL4Mef2.PR can result in viable flies or early pupal lethality.
Expression under the control of Scer\GAL4pnr-MD237 results in lethality before the pupal stage or semi-lethality at the pupal stage, depending on the insertion line used.