Hydrogel-Transplant Drug Combo (image) Brigham and Women's Hospital Caption In a depiction of a hand transplant, researchers illustrate how injecting a hydrogel-drug combo beneath the skin results in a controlled release of immunosuppressant drug to prevent rejection of the transplanted limb. Credit Praveen Kumar Vemula, Ph.D. Usage Restrictions Only use with associated press release. 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.