DMD Patient (IMAGE) UT Southwestern Medical Center Caption Dr. Eric Olson shows DMD patient Ben Dupree the dystrophin protein (red) produced in gene-edited heart muscle cells taken from Mr. Dupree's blood. A new study from Dr. Olson shows the CRISPR-Cas9 gene-editing tool can potentially correct a majority of the 3,000 types of mutations that cause DMD. Credit UT Southwestern Medical Center Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.