Reconstitution of various cell populations after double UCB transplantation. (A) T-cell, B-cell, and NK cell reconstitution. The bar graph in the right panel indicates the normal range for each of the lymphocyte subsets. (B) CD4⁺ T-cell subsets. (C) CD8⁺ T-cell subsets. (D) Monocytes. The 25th and 75th percentiles are denoted by the error bars; solid symbols (■, ♦, ▲, ●) denote median values.