Frequencies of naive CD31<sup>+</sup> T cells within the CD4<sup>+</sup>CD45RA<sup>+</sup> compartment remain constant over ages.


<p>(A) T cell subsets of CB or PBMCs analyzed by flow cytometry. Representative flow cytometry dot plots and histograms are shown with the percentage of CD4<sup>+</sup>CD45RA<sup>+</sup> T cell subsets for CB (top), infant (middle; 2.8 months), and adult (bottom) samples. (B) Frequencies of CD4<sup>+</sup> among lymphocytes, (C) of CD45RA<sup>+</sup> among CD4<sup>+</sup> T cells, and (D) CD31<sup>+</sup> among peripheral CD4<sup>+</sup>CD45<sup>+</sup> cells are shown (* <i>P<</i>0.05; two-sided ANOVA Tukey-Kramer post-hoc test). The mean value and standard deviations (SD) are indicated. Age of infants and children is indicated in months. n = number of individuals.</p

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