Percentage of CD4⁺FOXP3⁺ T cells and Teff/Treg ratio before and after transplantation. (A) Percentage of CD4⁺FOXP3⁺ T cells at various time points before and after transplantation. Bars denote 1 standard deviation. (B) Log_e of Teff/Treg ratio at various time points before and after transplantation. EN indicates enrollment; TCH, T-cell harvest (apheresis).