Exon 10 was removed from the locus via Cre mediated expression following the insertion of lox71 and loxP sites. Human FCMD exon 10 cDNA from a patient with Fukuyama Congenital Muscular Dystrophy with the causative retrotransposon was inserted between the lox66 and loxP sites of the targeting construct. Transcript expression level is 5% to 10% of normal. (J:114512)