Hprt1^{tm1(CAG-cre)Mnn}

An expression cassette in which a CMV enhancer and chicken beta-globin promoter driving Cre recombinase expression was inserted in reverse transcriptional orientation into exon 3 of the gene. A PGK-neomycin selection cassette was also inserted following the cre gene. Expression of Cre recombinase occurred at high levels in the female germline and fertilized eggs, and all offspring of heterozyous females display excision of reporter sequences. (J:75826)