Exon 17 was replaced with an exon 17 that contained a nucleotide substitution resulting in an amino acid substitution of histidine for arginine at position 552 (R552H). A floxed neo cassette was inserted downstream of exon 17 but was removed by transient cre expression. This mutation corresponds to human mutation R553H of FOXP2 that results in speech-language disorders. (J:132813)