A T2A-GAL4 cassette has been introduced into the endogenous Tehao locus, just upstream of the start codon (the Tehao coding sequence remains intact). A single loxP site is also present (a loxP-flanked Disc\RFPDsRed.3xP3.cUa marker originally inserted during the mutagenesis event has been excised using P1cre recombinase).