The transgene insert contains the following elements: 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), an EGFP reporter gene cassette, and Gata3 T cell and thymic NK cell enhancer (7.1 kb KpnI-SalI T cell element) Rr338. (J:281897)