The BTB/POZ domain has been deleted.
When ttk69.ΔBTB.Scer\UAS is driven by Scer\GAL4Bx-MS1096, the number of dorsal chemosensory bristles in the triple row is slightly reduced from ~ 18 in wild-type to ~ 15. The number of mechanosensory ventral triple row bristles is reduced to about 80 (compared to ~ 94).