A cDNA fragment containing wild-type H sequence has been reintroduced into the attP site present in HattP, restoring the wild-type H coding region without introns. There is a 136bp duplication in the 3'UTR. A residual attR site is present in the 5'UTR and a loxP cassette containing a w[+] marker is present in the 3'UTR.
Adult Hcwt.w+ homozygous mutants display rather mild bristle defects with, on average, 5 (out of 40 present in wild-type) of the large head and thorax bristles affected. Wing venation remains largely normal.