DNA Double Helix (IMAGE) Forschungsverbund Berlin Caption On the left is a structure of a RNA double helix. The blue spheres represent sodium counterions. On the right is an enlarged segment of the sugar-phosphate backbone of RNA, including bridging water molecules. Vibrations of the RNA backbone serve as sensitive real time probes for mapping the influence of the neighboring water molecules on RNA's structure and dynamics. Credit MBI 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.