Apc^tm1.1Tno

One loxP site was inserted into intron 13 and the other, with a PGK-neo cassette, into intron 14. Exon 14 was excised by Cre mediated recombination, resulting in a nonsense frame-shift mutation. Excision of the exon was confirmed by RT-PCR and sequencing analysis of mRNA isolated from the large intestine. Western blot detected the truncated product (70 kDa). (J:127452, J:156864)