TNFRSF10A and T-cell leukemia: Binding of the DR4-4 Fab to Jurkat (human T cell leukemia) cells, which express DR4 on their surface, was analyzed by flow cytometry after incubation with fluorescein isothiocyanate (FITC)-labeled DR4-4 Fab at 0.5, 10, and 20 μg/mL at 4 °C (Figure 2Da).