VIRUS 2 (IMAGE) Rice University Caption Rice University graduate student Eric Gomez holds a spiral-patterned mask he used to control gene-expression patterns in a petri dish. Cells in the dish contained a modified virus that responded to red light and delivered their genetic cargoes to the nuclei of cells. Credit Jeff Fitlow/Rice University 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.