A sequence cassette has been introduced into the attP site present in TI{TI}Tmem63KO, restoring the deleted coding Tmem63 sequence and tagging it with EGFP. The tag is followed by a 2A-GAL4 cassette, resulting in the GAL4 driver being expressed as a separate protein under the control of the endogenous Tmem63 regulatory sequences. A single loxP site is present downstream of the GAL4 sequence (markers present in the progenitor insertion and donor plasmid have been removed using P1cre).