Time-scaled Bayesian MCC tree of the HIV-1 subtype G <i>pol</i> PR/RT sequences (∼1,000 nt) circulating in West and Central Africa.

<p>Branches are colored according to the most probable location state of their descendent nodes as indicated at the legend (bottom left). Arcs indicate the positions of major subtype G clades characteristic of western (G_WA-I and G_WA-II) and central (G_CA) African regions. Asterisks point to key nodes with high posterior state probability support (<i>PSP</i>>0.85). Branch lengths are drawn to scale of years. The tree was automatically rooted under the assumption of a relaxed molecular clock.