FIG. 1.

Preparation of the eight virion protein fractions by treatment of the purified virions with Triton X-100 at different NaCl concentrations. The original location of the proteins in each of the four insoluble fractions (P1 to P4) and four soluble fractions was inferred from the electron micrographs and from other evidence (see text). Arrows in electron micrographs P1 and P2 indicate olive-shaped particles that exhibit a characteristic banded pattern, which can be seen more clearly in the P1 inset. Arrows in electron micrograph P3 indicate the condensed fibrillar structures inside the nucleocapsids. Scale bars = 100 nm.