Allogeneic T-cell stimulation by hES and FL derived DCs: The allogeneic stimulatory properties of DCs were assessed in a mixed leukocyte reaction assay using allogeneic T-cells. Graded numbers of sorted and irradiated DCs were co-cultured with 5 × 105 allogeneic T cells. BrdU incorporation was determined by FACS using a PE-conjugated antibody against BrdU. Histograms depict relative percent of BrdU uptake when compared to positive control cells stimulated with IL-2 and PHA. The X-axis is expressed as ratio of stimulator DCs cells to allogeneic responder T cells.