JILA Study Finds Crowding Has Big Effects on Biomolecules (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption This is an artist's conception of an RNA molecule (large purplish ladder) in the process of folding as it is crowded by a common polymer, polyethylene glycol (turquoise strands). RNA folds more frequently -- that is, the branch on the left folds upward -- when it is crowded. Credit Baxley/JILA and Talbott/NIST Usage Restrictions None 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.