A 463bp subsection from the second of five conserved blocks of the ap enhancer region and a 600bp subsection of the C5 block have been inserted into the attP site in TI{TI}apattPΔEnh, from which all 27kb of enhancer sequences have been removed.
Wing defects are seen in apOR463C5B/apDG3 flies. Wing size is reduced, but all margin structures are formed.