CD34 and acute lymphoblastic leukemia: We show human T cell development from CD34+CD38−/low (CD45RA−CD90+) CB cells using the MS5/DL1ind cell lines developed, comparable to MS5/DL1 cells that can sustain normal human T cell development from circulating CD34+CD7− cells [13] as well as proliferation of human T-ALL [13], [14].