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.
Phylogenetic tree of gp120 envelope clones derived from the blood and genital tract of all patients, constructed with the neighbor-joining method. Bootstrap values of key branch nodes are indicated (1,000 data sets). Different colors are used to distinguish sequences derived from each patient.
