FASTER, PLEASE: Gene Editing Offers Hope for Treating Duchenne Muscular Dystrophy, Studies Find. “Three research groups, working independently of one another, reported in the journal Science on Thursday that they had used the Crispr-Cas9 technique to treat mice with a defective dystrophin gene. Each group loaded the DNA-cutting system onto a virus that infected the mice’s muscle cells, and excised from the gene a defective stretch of DNA known as an exon.”