A TI{KozakGAL4} DNA cassette has been inserted into GCC88, replacing the coding sequence (coordinates of deleted sequence are 3R:11228191..11230580 , release 6 genome). This results in a simultaneous knock-out of GCC88 plus a knock-in of GAL4 that is expected to be expressed under the control of the endogenous regulatory sequences of GCC88 (predicted to gene trap all annotated transcripts of the gene). The deletion also removes part of CG17726. The TI{KozakGAL4} cassette was inserted via the CRISPR/Cas-9 drop-in technique, using a dsDNA donor vector with homology arms of length 200bp. The sgRNA sequences used to target the gene were: CCTGAGCAAACATGACAAGTTGG and CTATTTAGGATCTGTTTGTAGGG. The 5' end of the deletion associated with the insertion is 37 bp downstream of the 3' end of the CG17187 gene and may affect the proper 3' end formation of its transcripts.