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Intracellular presence of transforming growth factor (TGF)-beta in regulatory T cells (Tregs). Percentage of TGF-beta-positive Tregs (CD4+CD25highCD127low). H: percentage of TGF-beta+ Tregs in cord blood of children of healthy mothers (mean of 77 tested cord blood samples). A: percentage of TGF-beta+ Tregs in cord blood of children of allergic mothers (mean of 76 tested cord blood samples). *P ≤ 0·05.
