UASt regulatory sequences drive expression of an inverted repeat.
lethal - all die during larval stage, with Scer\GAL4Mef2.PR
partially lethal - majority die, with Scer\GAL4pnr-MD237
some die during pupal stage, with Scer\GAL4pnr-MD237
Expression under the control of Scer\GAL4Mef2.PR results in late larval lethality.