IntroductionT regulatory (T reg ) cells play an important role in the maintenance of self-tolerance, control of auto-immunity, and regulation of T-cell homeostasis, and they modulate overall immune responses against infectious agents and tumor cells. 1 Natural T reg cells develop during normal T-cell maturation in the thymus and represent 5% to 10% of the CD4 ϩ cell compartment in the peripheral blood. 2 These cells express CD4 and CD25 surface antigens as well as CTLA-4, GITR, CD103, CD62L, CD69, CD134, CD71…
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