A GAA triplet-repeat from the first intron of the human Hsap\FXN gene, with a GAA repeat length of 18 units, has been inserted into the intron of the orthologous D. melanogaster fh gene. The Hsap\FXN sequence includes sequence from the human first intron flanking the GAA repeats (157bp upstream and 125bp downstream sequence).
fh18GAA is rescued by fhUAS.cAa/Scer\GAL4da.Switch.PT