All but the N terminal BTB/POZ domain, the zinc finger domains, and the SA domain have been deleted.
When ttk69.BTB-ZFS.Scer\UAS is driven by Scer\GAL4Bx-MS1096, the dorsal chemosensory bristles in the triple row are completely absent. The number of mechanosensory ventral triple row bristles is slightly reduced to about 17 (compared to ~ 94).