Deletion endpoint is 5' to the start of translation.
Small clones (fewer than 150 cells) in the wing are often wild type or have a weak phenotype, even if on the dorsal surface.
Large dorsal wing clones cause wing blisters, small clones of approximately 5 cells have no phenotype and clones of 100 cells show a mild phenotype such as wrinkles confined to one end of the clone.