3-D Model (IMAGE) DOE/Brookhaven National Laboratory Caption This image shows a 3-D model based on electron microscopy data of the double-ring structure loaded onto a DNA helix. Credit Brookhaven National Laboratory Usage Restrictions with credit 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.