hydrogel-lab (IMAGE) Johns Hopkins University Caption Johns Hopkins engineering faculty members, from left, David Gracias, Thao (Vicky) Nguyen and Rebecca Schulman, teamed up with their students and used DNA sequences to trigger significant shape-changing in a hydrogel sample. Credit Will Kirk/Johns Hopkins University 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.