UASt regulatory elements drive expression of pcs.
presumptive embryonic/larval muscle system, with Scer\GAL4Mef2.PR, Scer\GAL4twi.PB
Expression of pcsScer\UAS.cBa under the control of both Scer\GAL4twi.PB and Scer\GAL4Mef2.PR results in embryonic muscle loss and defects in muscle morphogenesis.