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 adult/pharate lethality or late pupal lethality.
Expression under the control of Scer\GAL4pnr-MD237 results in loss of bristles on the notum in 0% or 10-20% of the Scer\GAL4pnr-MD237 expression domain, depending on the insertion line used.