Absolute number of donor T cells in the spleen, mesenteric lymph nodes, peripheral lymph nodes, liver, and colon of irradiated hosts day 2 or day 6 after the injection of 2.5 × 10⁶ (day 2) CD4⁺ T cells or 0.5 × 10⁶ (day 6) CD4⁺ T cells. Bars show the means of the absolute number of donor T cells, and brackets show standard errors of groups of mice given T cells from WT or gene-deficient donors. There were 3 separate experiments with 6 to 9 mice in each experiment. # indicates that the absolute number of donor T cells was less than 0.001 × 10⁶; ^*, statistically significant difference between WT and gene-deficient group (P ≤ .05). All hosts received 2 × 10⁶ WT TCD bone marrow cells.