Knot Illustration (IMAGE) University of California - San Diego Caption RNAs wound in a knot and bound by hnRNP proteins illustrates the intractable problem of RNA regulation addressed by Huelga et al. Credit UC San Diego School of Medicine 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.