A loxP site was inserted upstream of exon 1. An FRT-flanked neo cassette with a 3' loxP site was inserted downstream of exon 2. Flp-mediated recombination removed the neo cassette and left exons 1 and 2 floxed. (J:185426)
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A loxP site was inserted upstream of exon 1. An FRT-flanked neo cassette with a 3' loxP site was inserted downstream of exon 2. Flp-mediated recombination removed the neo cassette and left exons 1 and 2 floxed. (J:185426)