Protocell (IMAGE) University of Bristol Caption Enzyme-mediated Nitric Oxide Production in Vasoactive Erythrocyte Membrane-enclosed Coacervate Protocells. Credit Nature Chemistry (2020). 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.