Reconstitution of major T-cell populations after allogeneic HSCT. The recovery of each T-cell population in peripheral blood was assessed prospectively by flow cytometry. The median cell counts per microliter for each population are represented at each time point, as well as the corresponding median value in healthy donors (HD), with the interquartile range (IQ) range (whisker bars). (A) Median CD3⁺ (blue), CD4⁺ (green), and CD8⁺(red) T-cell counts. (B) Median CD4Treg (green) and CD4Tcon (red) counts. (C) Median CD4:CD8, Treg:CD8, and Treg:Tcon ratios. To compare the patterns of recovery of CD4Tregs and CD4Tcons in the same graph, different scales were used in panels B and C. aCD4, absolute CD4; aCD8, absolute CD8; aTcon, absolute Tcon; aTreg, absolute Treg.