Infiltration of WT and CCR5^-/- T_regs, measured by quantitation of eGFP⁺CD4⁺ cell infiltrates in lymphoid tissues and target organs on day 5 after transplantation. Lethally conditioned B6D2 mice received transplants containing WT TCD-BM and WT whole splenic T cells, with FACS-sorted WT/eGFP (▪) or CCR5^-/-/eGFP (▨) T_regs added. The numbers of eGFP⁺CD4⁺ cells infiltrating the organs shown were determined by flow cytometry on day 5 after transplantation. n = 4 mice/group. Data represent mean ± SEM.