A cDNA fragment containing mutated H sequence has been reintroduced into the attP site present in TI{TI}HattP, resulting in a H locus carrying the amino acid replacements L245A and L247A. A residual attR site is present in the 5'UTR and a single loxP site is present in the 3'UTR.
HLLAA has visible | dominant | adult stage phenotype, suppressible by Su(H)[+]/Su(H)attP
HLLAA has mechanosensory chaeta | adult stage phenotype, suppressible by Su(H)[+]/Su(H)attP