Senescent Cells (IMAGE) University at Buffalo Caption These are senescent cells under a microscope. The cells -- human lung fibroblasts -- became senescent after they or nearby cells were genetically engineered to increase activity of the CD36 gene. Areas stained in blue are regions where an enzyme associated with senescence is active. Credit Darleny Lizardo/Alan Siegel/University at Buffalo North Campus Confocal Imaging Facility Usage Restrictions This image may only be used with news reports discussing the research in the associated press release. 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.