Description Text

Using a technique called single-particle electron cryomicroscopy, the protein shell--called a capsid--of the epsilon 15 virus was imaged in unprecedented detail. The composite model, above, was assembled from more than 36,000 separate images and has a resolution of 4.5 angstroms. This image is colored according to depth: the capsid's deeper features appear in dark blue, while its outermost structures appear in yellow and orange.