Figure 1 Negative contrast electron micrographs of virions of Pyrobaculum spherical virus. (Left) Intact virions; arrows indicate spherical protrusions. (Right) Partially disrupted virions extruding disordered nucleoprotein core. The bars represent 100 nm.
(Modified from Häring et al. (2004). Virology, 323, 232–242.)
Figure 2 Genome organization of Pyrobaculum spherical virus showing location, sizes and direction of putative genes. VP2 and VP3 encode the minor and major structural proteins of the virion respectively.