Fluorsence: On and Off (IMAGE) University of Oregon Caption Graphic shows models of the on and off structural alignments of a photoswitchable fluorescent protein. Credit Courtesy S. James Remington 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.