Membranes 01 (IMAGE) University of Washington Caption Images of membranes (circles) taken using transmission electron cryomicroscopy. Top: membranes in a solution that contains no amino acids. Bottom: membranes in a solution containing serine, an amino acid, which triggers membranes to form multiple layers of concentric membranes. Scale bars: 100 nanometers. Credit Alex Mileant/Caitlin Cornell/University of Washington Usage Restrictions Must include 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.