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Intracellular presence of IL-10 in regulatory T cells (Tregs). Percentage of interleukin (IL)-10-positive Tregs (CD4+CD25highCD127low). H: percentage of IL-10+ Tregs in cord blood of children of healthy mothers (mean of 77 tested cord blood samples). A: percentage of IL-10+ Tregs in cord blood of children of allergic mothers (mean of 76 tested cord blood samples). **P ≤ 0·001.
