UAS regulatory sequences drive expression of a hairpin of Him sequences.
larval muscle system, with Scer\GAL4twi.PB
Approximately one-third of embryos expressing HimdsRNA.Scer\UAS under the control of Scer\GAL4twi.PB have six or more muscles per hemisegment with abnormal morphology. These abnormal muscles are misshapen and often thinner than in wild type.