Abstract
INTRODUCTIONWe describe here a procedure for introducing loxP sites into the mammalian genome. A typical gene-targeting approach to create a conditional null allele is presented, in which the initial placement of loxP sites is not deleterious to allele function. This can be modified to include knock-ins of point mutations, with such mutations flanked by loxP sites that can then be recombined by Cre expression. The choice of sequence or regulatory element to modify is dependent on the experimental design. Consideration must be given to the possible production of truncated and altered gene sequence products, or otherwise aberrantly functioning alleles.
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