High proportion of CD4(+) CD25(+) Treg and CD4(+)CD25(+)CD127(-) Treg is closely related to the high level of E2 during pregnancy. It suggested that high level of estrogen may induce an increase of CD4(+) CD25(+) Treg in peripheral blood, and then influence the immune function of pregnant women. The results of this experiment might play an important role of estrogen in immune-modulation during pregnancy.
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