UASt regulatory sequences drive expression of Gcn5 that has been mutated to contain the S478F amino acid replacement (this is equivalent to S502F in the human Hsap\KAT2B ortholog). The coding sequence is tagged at the C-terminal end with Tag:FLAG.
Gcn5S478F.UAS.Tag:FLAG/Scer\GAL4αTub84B.PL partially rescues Df(3L)sex204/Gcn5E333st