Cord blood-derived human CD34+ HSPCs were treated with vehicle (VH, 0.02% DMSO) or TCDD (0.01, 0.1, 1 or 10 nM) on day 0 and cultured for up to 28 days. Cells were harvested on day 14, 21 and 28. The percentage of the CD10+ cell population was assessed by flow cytometry, which includes common lymphoid progenitors (CLP) (CD10+ CD79α− CD19−), early-B cells (CD10+ CD79α+ CD19−) and pro-B cells (CD10+ CD79α+ CD19+). Data are presented as mean ± SE of triplicate measurements. Data are representative of three independent experiments with similar results.