A αTub84B promoter drives expression of fz, which has the Wnt inhibitory factor (WIF) domain of Hsap\WIF1 in place of the fz cysteine-rich domain.
fzGL31, fz2e2 clones rescued by fzWIFCRD.αTub84B still show observable defects in the patterning of the margin, with some places where a bristle socket has formed in the place of an apparently missing bristle.