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Distribution of T cell subsets in healthy donors. TN, TCM, TEM, and TEMRA cells are depicted as percentages of CD8+ T cells in (A), and of CD4+ T cells in (B). Individuals with cytomegalovirus (CMV) seropositivity are depicted in red (n = 10) and individuals that are seronegative for CMV are depicted in blue (n = 11). For statistical analysis, a non-parametric two-tailed Mann–Whitney U-test was used (*: p < 0.05; ***: p < 0.001).
