Florent Samain and DNA Sensors (image) Stanford University Caption Florent Samain displays a fluorescence microscope image showing how the fluorescent sensors change color in the presence of organic vapors. Credit Linda Cicero, Stanford University News Service Usage Restrictions May not be altered or sold for profit. 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.