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.
Study design. (a) Vaccine plasmids were constructed to express four forms of HIV-1 Env: gp120, gp140, gp160, and noninfectious, virus-like particles. gp120 is the nonreceptor-binding domain of Env. gp140 is the entire extracellular domain of Env and contains oligomerization sequences. (b) The immunization schedule used is shown.
