A loxP site was inserted into intron 3 and an FRT site flanked neomycin resistance gene cassette and a second loxP site were inserted into intron 9. Subsquently, an FRT site flanked puromycin resistance gene cassette and a third loxP site were inserted downstream of exon 22. Subsequent flp-mediated recombination removed the two selection cassettes, leaving exons 4 to 9 and 10 to 22 floxed. (J:235641)