Figure 3From: The HIV-1 pandemic: does the selective sweep in chimpanzees mirror humankind’s future?Pie charts showing the presence/absence of MHC class I intron 2 lineages in humans and chimpanzees. A colored section in a pie indicates the presence of a particular intron 2 lineage in that species; red for MHC-A, blue for MHC-B, and orange for MHC-C.Back to article page