Shown on the left is a surface rendered diagram of adenovirus illustrating the organization of the major and minor capsid proteins (in different colors) on the outer capsid (protein shell of the virus). On the right is a close-up view of the penton base-fiber complex found at the vertices of the adenovirus particle, highlighting the electron density (red) corresponding to the shaft region of the fiber molecule inserted deep into the pore formed by the pentameric penton base molecules.