Proliferative responses of rhesus CD4⁺ T cells derived from transduced CD34⁺ cells. CD4⁺ T cells were derived from transduced or untransduced CD34⁺ cells as described in the legend to Fig 2. T cells were stimulated with lectin (5 μg/mL ConA) and irradiated PBMC in the presence of IL-2 (20 U/mL). Data are plotted as the mean of five replicate wells ± standard deviation and are representative of two independent experiments.