(A) Absolute counts for CD4+, CD8+ T cells and NK cells in YATECs (median age, 22.0 years). Counts in young adult (median age, 21.9 years), middle-aged (median age, 35.3 years), and elderly (median age, 82 years) controls are shown for comparison. (B) Proportions of naive (CD45RA+CCR7+CD27+) CD4+ or CD8+ T cells in YATECs and young, middle-aged, or elderly controls. (C) Proportions of CD31+ naive CD4+ T cells. (D) Proportions of CD57+ cells within memory CD4+ or CD8+ T cells. (E) Correlation between naive and CD57+ memory CD4+ or CD8+ T cell percentages in YATECs. The horizontal lines in A–D indicate the median. P values were calculated by the Mann-Whitney U test for group comparisons. Spearman’s rank test was used to determine correlations.