Maximum Likelihood phylogenetic tree of full-length gag HIV sub-subtype A sequences: HIV-1A sub-subtypes are shown in red (A1), green (A2), purple (A3), turquoise (A4), blue (A6) colors.

Grey-colored branches signify ≥0.9 support value. For clarity, unrelated subtype A1 clusters have been collapsed. The black arrow indicates the A6 ancestral node shared by A1 sequences. SIV gag sequence from chimpanzee was used as an outlier to root the tree.

(TIFF)