ADP-Ribosylation (IMAGE) University of Zurich Caption This is a photograph of cells in culture react to stress by massive ADP-ribosylation (red) in the nucleus (blue). Credit University of Zurich 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.