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 flightless flies or adult/pharate lethality.
Expression under the control of Scer\GAL4Mef2.PR results in grossly normal adult indirect flight muscles.
Expression under the control of Scer\GAL4Mef2.PR results in frayed myofibrils in the adult indirect flight muscles.
Expression under the control of Scer\GAL4Mef2.PR results in sarcomeres with broadened Z-lines in the adult indirect flight muscles.