Gt(ROSA)26Sor^{tm1.1(birA)Mejr}

An HA (hemagglutinin) tagged E. coli bacterial birA, bifunctional protein (biotin ligase), gene was inserted into exon 3 of the rabbit beta-globin gene. The entire birA ORF, with the rabbit beta globin splice acceptor and transcription termination sequences were excised to generate a targeting vector that also contained a floxed PGK- puromycin selection cassette. This targeting vector was inserted into the first intron of the Gt(ROSA)26Sor gene. Cre-mediated recombination removed the floxed puromycin cassette. Western blot of mutants demonstrated the expression of birA in all tissues tested, though levels of expression varied from tissue to tissue. (J:100227)