Expression of the ap coding region is governed by UASt regulatory region.
When expression is driven by Scer\GAL4dpp.blk1 or Scer\GAL4ap-md544, wing abnormalities do not occur in the dorsal compartment.
apUAS.cFa, Scer\GAL4ap-md544 is a suppressor of visible phenotype of ChiUAS.cFa, Scer\GAL4ap-md544