Cell culture plates (IMAGE) University of Bonn Caption Cell culture plates with stained cells, in which virus replication can be quantified by the ‚holes' that virus infection causes in the cell lawn. Credit © Volker Lannert/ University of Bonn Usage Restrictions Please use this picture only in connection with the 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.