Hydrogels (IMAGE) Johns Hopkins Medicine Caption These are hydrogels inside a cell. Credit Takanari Inoue, Ph.D., and Hideki Nakamura, Ph.D 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.