Markers for Cellular Senescence (IMAGE) Buck Institute for Research on Aging Caption Brightfield microscopy images of senescent lung fibroblasts (left) and senescent renal epithelial cells (right). Blue staining of the cells is an indicator of senescence-associated beta-galactosidase activity, a marker present only on senescent cells. Credit Nathan Basisty, PhD 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.