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. 2011 Oct 17;6(10):e25690. doi: 10.1371/journal.pone.0025690

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Stam et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Frequency of responding CD69⁺ T-cells, among CD4⁺ T-cells (A) and CD8⁺ T-cells (B), in peripheral blood samples from infants (n = 20) at 6 and 12 months of age after in vitro stimulation with PHA, SEB, PPD and TT. Horizontal lines represent the median percentage. The p-values were calculated using the Wilcoxon signed ranks test for paired values.