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Exons 4 and 5 were replaced with a floxed PGK-neo cassette via homologous recombination resulting in the deletion of the BRCT domain. An 80 kDa protein was expressed from the mutant allele as a result of a start codon originating in the PGK-neo cassette and splicing from intron 5 to exon 6. The mutant protein lacks the FHA and BRCT domains and retains Mre11a-binding activity. (J:75956)