DMD and Duchenne muscular dystrophy: 65 % of DMD patients harbour dystrophin gene deletions in a commonly mutated region including exons 45–55 with genomic breakpoints (ie, the endpoint of where the deletions actually occurs) lying within intron 44, and exons 2–19 with genomic breakpoints commonly found in introns 2 and 7 and alsoextending toward the downstream introns (OMIM; 300376) [3].