Illustrations of Double-Stranded DNA, RNA and a Wormlike Bead Chain Model (image) American Institute of Physics Share Print E-Mail Caption Illustrations of double-stranded DNA, RNA and a wormlike bead chain model. The radial distribution of the end-to-end distance, Ree, and contour length, L, are shown. Credit Xi Zhang/Bao/Wu/Zhu/Tan Usage Restrictions This image may be used only with appropriate credit. Share Print E-Mail 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.