Dystrophin Lights Up (IMAGE) Duke University Caption These images highlight the stark contrast between mouse models of untreated Duchenne muscular dystrophy (left) and those treated with a CRISPR-based genetic therapy after one year (right). On the right, green indicates a higher level of dystrophin gene expression. The dark spots in the inset show T cells from these mice responding to the bacterial Cas9 protein, indicating the presence of an immune response to the therapy. Credit Charles Gersbach, Duke University 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.