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.
Maximum likelihood phylogenetic tree based on 536 reverse transcriptase nucleotide sequences sampled between 1989 and 2012 in 12 countries from the Middle East and North Africa (MENA) region.
The tree is rooted on an Simian Immunodeficiency Virus (SIV) strain isolated from a chimpanzee (CPZ) in 1985 (GenBank accession number of the SIV.CPZ sequence: AF103818).
