Fig. 12.
Negatively stained (PTA) spheres and tubules of hepatitis B surface antigen and Dane particles (infective virus) from the blood of an infected individual. The Dane particle is 40–45 nm in diameter and the surface antigen 18–22 nm wide.
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.