An FRT-flanked neomycin resistance cassette with 3' loxP2272 and loxP5171 site was inserted upstream of exon 2. An inverted EGFP expression cassette with 3' loxP2272 and loxP5171 sites was inserted downstream of exon 2 without affecting Mir763. Flp-mediated recombination removed the selection cassette. (J:211779)