The RMCE cassette of the Mi{MIC}GABA-B-R1MI01930 insertion has been replaced with a FlpTag conditional tagging cassette that is inserted in the opposite orientation to the direction of GABA-B-R1 transcription. In the absence of FLP, the GABA-B-R1 gene is not tagged, but in the presence of FLP recombinase, the FlpTag cassette is stably inverted, resulting in conditional tagging of the GABA-B-R1 gene.