A Negative Feedback Loop Controls Inflammation (image) University of Arizona Share Print E-Mail Caption The researchers discovered a negative feedback loop preventing our immune system from overreacting: Dendritic cells activate T-cells, which, once activated, trigger a signal telling the dendritic cells to stop. Credit Cynthia Orensztajn Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. Share Print E-Mail 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.