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CD4+CD25+forkhead box protein 3 (FoxP3+ ) cells in peripheral blood. We can see an increased natural regulatory T cell (nTreg) population in Down syndrome (DS) subjects compared to healthy donors (HD) (DS mean 5·231 ± 0·6065, n = 29, HD mean 3·076 ± 0·3140, n = 29, P = 0.0026); no outliers were found.
