Oncogene-Induced Senescence (image) The Wistar Institute Share Print E-Mail Caption These pictures represent one experiment to determine whether cells have undergone senescence in the lab. After cells are exposed to a cancer-causing mutation and do not have enough DNA building blocks, they become larger and flatter and stain bright blue. This experiment can also be performed in cancer cells and in human tissues to observe senescence within the human body. Credit Katherine Aird/The Wistar Institute Usage Restrictions Credit: Katherine Aird/The Wistar Institute 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.