UASt regulatory sequences drive expression of an inverted repeat.
lethal - all die during P-stage, with Scer\GAL4Mef2.PR
partially lethal, with Scer\GAL4tin.CΔ4
viable, with Scer\GAL4pnr-MD237
Expression under the control of Scer\GAL4Mef2.PR results in early pupal lethality.