d - Electronmicrograph of vitrified PBCV-1 virions.
e - Shaded-surface presentations of 3D reconstructions of PBCV-1 viewed down an icosahedral 3-fold axis.
f - Central section of the reconstruction density map as viewed along a twofold axis. Icosahedral 2-, 3- and 5-foldsymmetry axis are identified in the section. Inset is a magnified (2x) view of the region near a pentavalent capsomer and reveals an axial channel (arrow).

Photographs were kindly provided by Tim Baker, Purdue University