By CRISPR/Cas9 system, mutation was introduced in dystrophin (Dmd) gene of Wistar-Imamichi rat: Deletion of exon3 to exon16 (a part of intron 3 remain). This strain died out in 2015.
This rat exhibits similar phenotypes to Becker muscular dystrophy(BMD): focal skeletal muscle necrosis and regeneration at 8 weeks of age and muscular hypertrophy at 8 months of age in affected male rats.