The transgene insert contains the following elements: an FRT site flanked neomycin resistance gene cassette, Gata3 promoter 1b (-1314 to +1 relative to ATG start site; contains downstream promoter, alternative 1st exon 1b, intron 1b and 5' UTR part of exon 2), and an EGFP reporter gene cassette. (J:281897)