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 early larval lethality or early pupal lethality.
Expression under the control of Scer\GAL4Mef2.PR results in grossly normal larval body wall muscles.
Expression under the control of Scer\GAL4Mef2.PR results in sarcomeres with reduced Z-lines in the larval body wall muscles.
Expression under the control of Scer\GAL4pnr-MD237 results in lethality before the pupal stage.