UAS regulatory sequences drive strong (line 1) expression of around 80-100 (0.4-0.5 kb) Zzzz\UGGAA (a repeat tract associated with human SCA31) repeats, followed by a bridging sequence (complex of UGGGAA, UGGAA, UAGAA) and then a (UAGAA)n, (UAAAA UAGAA)n stretch.