Donor T-cell chimerism. Blood mononuclear cells of BALB/c recipients given graded numbers of DBA/2 donor spleen cells were stained with anti-TCRαβ versus anti-CD5.1. The TCRαβ⁺ T cells among blood mononuclear cells are gated and the percentage of T cells is shown above the gating boxes. Gated T cells are shown in TCRαβ versus CD5.1 in the right panels. The donor T cells (CD5.1⁺) are gated and the percentage of donor T cells in total T cells is shown above the gating boxes. The donor-cell dose for each group was shown on the right side of the panels. A representative of 10 recipients in each group is shown.