Treg Cells (IMAGE) Johns Hopkins Medicine Caption Treg cells emit powerful immune suppressive signals to the immune system which serve to protect tumor cells. By killing Tregs, s-DAB-IL-2 and s-DAB-IL-2(V6A) remove the suppressive signals and unleash potent immune responses against the tumor. Credit Johns Hopkins Kimmel Cancer Center 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.