A sequence cassette has been introduced into the attP site present in TI{TI}Gad1attP, restoring the deleted Gad1 sequence and tagging it with 2xTag:MYC. The tag is followed by a 2A-FLP cassette, resulting in the FLP recombinase being expressed as a separate protein under the control of the endogenous Gad1 regulatory sequences. A single loxP site is present downstream of the recombinase sequence (markers present in the progenitor insertion and donor plasmid have been removed using P1cre).