The first 285 amino acids of ttk69.UAS have been removed.
When ttk69.R113.Scer\UAS is driven by Scer\GAL4Bx-MS1096, the number of dorsal chemosensory bristles in the triple row is reduced from ~ 18 in wild-type to ~ 6. The number of mechanosensory ventral triple row bristles appears unaffected.