(IMAGE) Université de Genève Caption NbE (red) binds the specific receptor responsible for opioid action (blue) and blocks off other small molecules (white/yellow/red). Credit © UNIGE 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.