The U.S. FDA has granted Precision Biosciences Inc.’s PBGENE-DMD orphan drug designation for the treatment of Duchenne muscular dystrophy (DMD). PBGENE-DMD uses two complementary Arcus nucleases delivered via a one-time administration in a single AAV to excise exons 45-55 of the dystrophin gene in order to restore near full-length dystrophin protein within the body to improve functional outcomes.