Polyacrylamide Hydrogel Exhibiting Edge Waving Configuration (IMAGE) Proceedings of the National Academy of Sciences Caption Polyacrylamide hydrogel exhibiting edge waving configuration. Credit Image courtesy of Changjin Huang. 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.