Quality of Repopulation in Nonobese Diabetic Severe Combined Immunodeficient Mice Engrafted With Expanded Cord Blood CD34+ Cells

To the Editor: In a recent issue of Blood, Guenechea et al[1][1]reported that ex vivo cytokine-expanded CD34+ cord blood cells retained nonobese diabetic/severe combined immunodeficient (NOD/SCID) repopulating activity of fresh cells, although there was a significant delay in the time to achieve