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Natural ranges of the four chimpanzee subspecies (top) and locations of wild chimpanzee study sites WE, MT, DG, DP, BQ, EK, CP, BB, MB, and LB in southern Cameroon (inset and bottom). Field sites with endemic SIVcpzPtt infection are color-coded to correspond with the SIVcpzPtt lineages shown in Figs. 3 and 4.
