Enzyme DNA Nanoparticle Interaction (IMAGE) Duke University Caption Normally, the enzyme DNase cuts cell-free DNA into tiny pieces (top). But when DNA is attached to a nanoparticle, the enzyme can only clip the ends, leaving a DNA "corona" around the nanoparticle. These complexes are believed to contribute to the symptoms of many autoimmune diseases. Credit Duke University Usage Restrictions None License Original 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.