In recent years, regulatory T (Treg) cells have reached centre-stage in immune tolerance research. A role for Treg cells in preventing autoimmunity or generating transplantation tolerance is now undisputed. However, in spite of a surge in publications dedicated to Treg cells, surprisingly little is known about their induction, biology and mechanisms of action. In this Opinion, we discuss the facts and the controversies regarding their role in transplantation tolerance. We suggest that periphe...Expand abstract
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Dominant tolerance: activation thresholds for peripheral generation of regulatory T cells.
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