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Fig. 3. Generation of a conditional cell-ablation mouse by gene targeting.
(A) The DTA176 coding sequence is targeted into the Rosa26 locus, and
is not expressed until the transcription stop is removed by Cre-mediated
recombination. (B) Southern blot screen for ES cells and PCR genotyping
for animals. EcoRV digestion and a 5' external probe were used
to identify targeted ES cells, which have a 4.1 kb band in addition to the
wild-type 11.5 kb band.