Stains (IMAGE) Johns Hopkins Medicine Caption The red dots in these photos indicate cancer cells that are dying. The image on the left shows the amount of cell death in a control-treated tumor and, on the right, in a microRNA-treated tumor. Tumor sections were stained with TUNEL, a marker for cells undergoing programmed cell death. Credit Johns Hopkins Medicine 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.