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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Infect Genet Evol. 2016 Jul 6;46:308–323. doi: 10.1016/j.meegid.2016.07.006

Figure 1. Studies in natural hosts of SIVs lead to the hypothesis that susceptibility to SIV/HIV transmission is proportional to the levels of CD4+ T-cells expressing CCR5+ at the mucosal sites, which are higher in nonnatural hosts than natural hosts and are also correlated with age.

Figure 1

Each separate graphic represents flow cytometry gating for total gut CD4+ CCR5+ T-cells in the respective hosts, with the total percent population of the CD4+ CCR5+ T-cells given in the right hand corner.