A TI{KozakGAL4} DNA cassette has been inserted into Roc1a, replacing the coding sequence (coordinates of deleted sequence are X:647448..647983 , release 6 genome and the 5' cut is within the start codon). This results in a simultaneous knock-out of Roc1a plus a knock-in of GAL4 that is expected to be expressed under the control of the endogenous regulatory sequences of Roc1a (predicted to gene trap all annotated transcripts of the gene). 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: ATCCTCGTCGACTTCCATGGTGG and ACTTCCCGCAAGCTAGATGATGG.