TRECs.

Numbers of TRECs in both CD45RA⁻CD4⁺ and CD45RA⁺CD4⁺ T-cell subsets are indicated in white and gray, respectively, for the 9 tested patients. Patients nos.1 to 5 belonged to the CD34⁺-selected group and patients nos. 6 to 9 belonged to the unselected group. The median number of TRECs was 10-fold higher in the CD45RA⁺ compared with the CD45RA⁻ subset in patients receiving CD34⁺-selected graft, as well as in those receiving unselected graft (18 versus 1.8 × 10³/10⁶cells in the whole population of patients tested;P < .001).