Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Hexagon particles with (upper left) or without (lower right) outer membrane as visualized by by negative staining (A) followed by tomography (B). In (C) the outer membrane (1), capsid (2) and inner core (3) of a different enveloped particle are indicated by arrows. In (B) and (C) (ortho)slices through virus particles are shown.
