UASt regulatory sequences drive expression of an inverted repeat.
lethal | pupal stage, with Scer\GAL4pnr-MD237
partially lethal - majority die | pupal stage, with Scer\GAL4pnr-MD237
Expression under the control of Scer\GAL4pnr-MD237 results in lethality or semi-lethality at the pupal stage, depending on the insertion line used.