Alex Mileant/Caitlin Cornell/University of Washington
Images of membranes (circles) taken using transmission electron cryomicroscopy. Top: membranes in a solution of magnesium chloride, a salt that disrupts membranes, and no amino acids. Bottom: membranes in a solution of magnesium chloride and serine, an amino acid, which triggers membranes to form multiple layers of concentric membranes. Scale bars: 100 nanometers.