FIG 6.

Electron micrographs of different forms of SMV1. (A) Tailless SMV1 particles isolated immediately after release. (B and C) SMV1 develops 1 or 2 tails outside the host cell. The development occurs at high temperatures (>75°C). Often one longer and one shorter tail are observed (blue arrow). (D) Only one pole appears to have short tail fibers, which can attach to tail fibers of other virions to form characteristic rosettes (B). All preparations were negatively stained with 2% uranyl acetate.