IMAGE (IMAGE) National Institutes of Natural Sciences Caption The Drosophila phototransduction cascade is shown. The signaling cascade downstream of DAG was unclear. This study identified an endocannabinoid 2-LG as a TRP channel activator. Credit Takaaki Sokabe Usage Restrictions none 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.