aGVHD delays the naive CD4 T-lymphocyte reconstitution. T-cell subset reconstitution was measured by flow cytometry before and 3, 6, 12, and 24 months after transplantation on patients with (, plain gray lines, n = 68) or without aGVHD (●, dotted black lines, n = 25). Mean ± SE CD4⁺ (A), CD8⁺ (B), naive CD4⁺CD45RA⁺CD62L⁺ (C), or naive CD8⁺CD45RA⁺CD62L⁺ (D) T cells/mm³ were represented. *P < .05.