C. elegans Stoplight (IMAGE) Osaka Metropolitan University Caption OMU scientists have developed a system that can control the behavior of the nematode worm Caenorhabditis elegans, using two different light-sensitive proteins called opsins that are triggered by green and UV lights. The opsins are highly sensitive and can be switched on and off repeatedly, a property that is highly relevant to many avenues of biological research and the development of targeted drug treatments. Credit Osaka Metropolitan University Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original 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.