Figure 1From: Ability of HIV-1 Nef to downregulate CD4 and HLA class I differs among viral subtypesMaximum likelihood phylogenetic tree of patient-derived HIV-1 Nef clones. HIV-1 subtype A (red), B (orange), C (green), and D (blue) Nef sequences form distinct clusters within the tree. The control SF2 Nef sequence (subtype B) is shown in black.Back to article page