Figure 2.

Optical micrograph of the vesicle dispersion in a sample taken during the described evolution experiment. The picture was produced under phase-contrast illumination in order to increase the visibility of the vesicles. The small fraction of vesicles larger than 2 µm can be resolved, and their membrane structure becomes apparent (arrows). Other particles in the image are primarily crystallized components. The picture was taken on a sample with a vesicle concentration of approximately 1 vol %, at neutral pH and at room temperature.