Atm^tm1Fwa

Exons 50 - 52 were replaced by a neomycin cassette. RT-PCR analysis detected two transcripts. One splices exon 49 to a site within the neomycin gene, resulting in an in-frame stop codon. The second splices exon 49 in-frame to exon 53. However, protein was not detected by western blot in thymus or brain of homozygous mutant mice. (J:61201)