Optogenetic stimulation (IMAGE) University of Barcelona Caption By administrating the opsin gen (green) to the brain cortex, we can selectively activate the neuronal terminals in the striatum, which express the protein. This stimulation enabled an improvement in the symptoms in the experimental model of Huntington's disease. Credit Photo: Sara Conde Berriozabal Usage Restrictions You may state that the image may only be used with appropriate caption or credit. 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.