FACS analyses of CCR-5 surface expression on human thymocytes. Thymocytes labelled with CD4-PE-cychrome, CD8-PE and CCR-5-FITC were gated on DN, CD4⁺, DP, and CD8⁺ subpopulations for analyses of CCR-5 expression. The FACS profiles are representative of experiments using n = 4 different human thymus donors.