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Genesis. 2002 Mar;32(3):199-202.

A Cre/loxP-deleter transgenic line in mouse strain 129S1/SvImJ.

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Division of Biology, Beckman Research Institute of the City of Hope, Duarte, California 91010-3011, USA.


A Cre recombinase expression cassette was inserted into the X-linked Hprt locus by gene targeting in a mouse embryonic stem (ES) cell line isogenic to strain 129S1/SvImJ (129S1), then the transgene was introduced into 129S1 mice through ES cell chimeras. When females hemizygous for this transgene were mated to males carrying a neomycin selection cassette flanked by loxP sites, the cassette was always excised regardless of Cre inheritance and without detectable mosaicism. The usefulness of this "Cre-deleter" transgenic line is in its efficiency and defined genetic status in terms of mouse strain and location of the transgene.

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