This strain was made by electroporation of DAc8 embryonic stem cells with a targeting vector containing 5.8kb 5' and 1.7kb 3' homology arms. A G843D point mutation is introduced into the Pex1 gene. The 12th and 13th exons are flanked with two loxP sites. A FRT-CAG-Pac-FRT cassette is inserted into the intron between Pex1 13th and 14th exon. This strain mimics the Peroxisomal Disorders. Heterozygote does not show any abnormalities.