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V3 loop diversity among different ape lentiviruses. The phenetic clustering of SIVgor (red), SIVcpz (black), and HIV-1 (blue) V3 amino acid sequences is shown. Four major V3 clusters are apparent: (i) HIV-1 group M, (ii) the MB/LB strains of SIVcpz, (iii) all other SIVcpz strains (except GAB2) plus HIV-1 group N and SIVgor, and (iv) HIV-1 group O. Dashes indicate gaps introduced for better alignment.
