Image (IMAGE) NIH/National Eye Institute Caption Left: A fruit fly showing location of brain pacemaker cells that express rhodopsin 7. Right: Depiction of rhodopsin 7 molecular structure. Credit Craig Montell 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.